Journal of Geophysical Research: Atmospheres最新文献_第5页

Airborne Measurements Reveal High Spatiotemporal Variation and the Heavy-Tail Characteristic of Nitrous Oxide Emissions in Iowa 机载测量揭示了爱荷华州氧化亚氮排放的高时空变化和重尾特征

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-28 DOI: 10.1029/2024JD041403

Natasha Dacic, Genevieve Plant, Eric A. Kort

{"title":"Airborne Measurements Reveal High Spatiotemporal Variation and the Heavy-Tail Characteristic of Nitrous Oxide Emissions in Iowa","authors":"Natasha Dacic, Genevieve Plant, Eric A. Kort","doi":"10.1029/2024JD041403","DOIUrl":"https://doi.org/10.1029/2024JD041403","url":null,"abstract":"Nitrous oxide (N2O) emissions from croplands contribute substantially to the climate impact of agriculture. Emissions of N2O are controlled by both anthropogenic and environmental factors and can vary by orders of magnitude over short times and distances. This nature of emissions is difficult to capture with models and presents an observational challenge. In the 2021 and 2022 growing season, we collected airborne measurements of N2O over Iowa to characterize N2O emissions at the farm to multi-county spatial scales across days. We link our airborne observations to surface emissions using a Lagrangian particle dispersion model and quantify emissions using a Bayesian inversion framework. We find emissions magnitudes across Iowa, showing greater skew than modeled predictions, with a small fraction of fields contributing disproportionately to the total [25% of the domain contributing to 52%–77% of total emissions]. In addition to the high spatial variation, we find high temporal variability between flight days by a factor of 2 at the 100 km scale, and an order of magnitude at the 2 km scale], with peak emissions occurring at median soil moisture. This work illustrates the importance of transient, intense emissions from concentrated areas in explaining total cropland emissions, and demonstrates how airborne measurements can provide insights into variation that may be missed by other observational systems. Investigation into environmental factors highlights the need for observations, models and their input data to be spatiotemporally resolved to enable direct comparison, facilitating evaluation of predicted and reported emissions and providing guidance and feedback on mitigation strategies.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD041403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Substantial Cold Bias During Wintertime Cold Extremes in the Southern Cascadia Region in Historical CMIP6 Simulations 在 CMIP6 历史模拟中，南卡斯卡迪亚地区冬季极端低温期间存在严重低温偏差

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-28 DOI: 10.1029/2024JD041483

M. H. Rogers, G. Mauger, N. Cristea

{"title":"Substantial Cold Bias During Wintertime Cold Extremes in the Southern Cascadia Region in Historical CMIP6 Simulations","authors":"M. H. Rogers, G. Mauger, N. Cristea","doi":"10.1029/2024JD041483","DOIUrl":"https://doi.org/10.1029/2024JD041483","url":null,"abstract":"Global climate models often simulate atmospheric conditions incorrectly due to their coarse grid resolution, flaws in their dynamics, and biases resulting from parameterization schemes. Here we document a bias in the magnitude and extent of minimum temperature extremes in the CMIP6 model ensemble, relative to ERA5. The bias is present in the southern Cascadia region (i.e., Pacific Northwestern United States and southwestern British Columbia, Canada, spanning from the coast to the Rocky Mountains), with some models showing a bias magnitude in excess of −10°C in the first percentile of daily winter minimum temperature. The sea level pressure pattern for these events is similar in CMIP6 models and ERA5, showing high anomalies in the Northeast Pacific that are indicative of an atmospheric blocking pattern and consequently more northerly flow. Though this atmospheric blocking pattern is typically concurrent with cold winter temperatures across much of North America, Rocky and Cascade mountain ranges prevent the cold air from reaching the southern Cascadia region as confirmed by the observations and reanalysis. Our results suggest that the bias in CMIP6 minimum temperatures is a result of unresolved topography in the Rockies and Cascade mountain ranges, such that the terrain does not adequately block cold air advection from reaching the southern Cascadia region.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD041483","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Satellite-Based Surveys Reveal Substantial Methane Point-Source Emissions in Major Oil & Gas Basins of North America During 2022–2023 卫星勘测显示 2022-2023 年期间北美主要油气盆地的甲烷点源排放量巨大

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-28 DOI: 10.1029/2024JD040870

Fei Li, Shengxi Bai, Keer Lin, Chenxi Feng, Shiwei Sun, Shaohua Zhao, Zhongting Wang, Wei Zhou, Chunyan Zhou, Yongguang Zhang

{"title":"Satellite-Based Surveys Reveal Substantial Methane Point-Source Emissions in Major Oil & Gas Basins of North America During 2022–2023","authors":"Fei Li, Shengxi Bai, Keer Lin, Chenxi Feng, Shiwei Sun, Shaohua Zhao, Zhongting Wang, Wei Zhou, Chunyan Zhou, Yongguang Zhang","doi":"10.1029/2024JD040870","DOIUrl":"https://doi.org/10.1029/2024JD040870","url":null,"abstract":"Utilizing imaging spectroscopy technology to identify methane super-emitters plays a vital role in mitigating methane emissions in the Oil & Gas (O&G) sector. While earlier research has uncovered significant point-source methane emissions from O&G production in the US and Canada, which are key regions with large methane emissions, a comprehensive post-COVID-19 survey has been notably absent. Here, we perform a detailed survey of methane super-emitters across multiple basins of North America (Marcellus Shale, Haynesville/Bossier Shale, Permian Basin and Montney Shale) using the new Chinese Gaofen5-01A/02 (GF5-01A/02) satellite measurements during 2022–2023. We detect 139 individual methane plumes emanating from 122 point sources, with flux rates ranging from 519 to 16,071 kg hr−1. These emissions exhibit a highly skewed and heavy-tailed distribution, constituting approximately 23% of the flux inversion with TROPOMI in the sample region, with a range of 13%–40%. Moreover, we observe a 66.7% reduction in methane emissions in Permian Basin during COVID-19, followed by fluctuations until spring 2023. By summer 2023, methane emissions rebound to twice their previous magnitude (1.68 ± 0.58 Tg a−1). Using these point-source surveys, we further quantify a regional methane emission of 2.69 ± 0.86 Tg a−1 in Permian Basin. This estimation closely aligns with top-down inversions (2.22 ± 0.40 Tg a−1) from TROPOMI. The upscale estimation underscores the effectiveness of high-resolution remote sensing measurements in improving bottom-up emissions inventories and refining regional methane emission assessments. Our results highlight the potential climate benefits derived from regular monitoring and specific remediation efforts focused on relatively few strong point-source emissions.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of Gas-Particle Partitioning of Semi-Volatile n-Alkanes and PAHs in Nanjing, China, and Denver, United States: Effects of Vapor Pressure and Surface Adsorption Estimation 中国南京和美国丹佛半挥发性正烷烃和多环芳烃的气体-颗粒物分馏模拟：蒸汽压力和表面吸附估算的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-28 DOI: 10.1029/2024JD041368

Zhiyan Zhou, Zishu Wang, Wei Feng, Chao Qin, Hong Liao, Yuhang Wang, Mingjie Xie

{"title":"Simulation of Gas-Particle Partitioning of Semi-Volatile n-Alkanes and PAHs in Nanjing, China, and Denver, United States: Effects of Vapor Pressure and Surface Adsorption Estimation","authors":"Zhiyan Zhou, Zishu Wang, Wei Feng, Chao Qin, Hong Liao, Yuhang Wang, Mingjie Xie","doi":"10.1029/2024JD041368","DOIUrl":"https://doi.org/10.1029/2024JD041368","url":null,"abstract":"The concentration data of semi-volatile n-alkanes and PAHs in the gas phase and in PM2.5 were obtained from Nanjing and Denver. First, the gas-particle partitioning coefficients of the target compounds were calculated and compared with the predictions based on the equilibrium absorptive partitioning theory. Although the vapor pressure (poL) estimation method was selected to improve the agreement between measured and predicted partitioning coefficients, n-alkanes in Denver and PAHs in both cities exhibited stronger sorption to PM2.5 than predicted. By including the adsorption mechanism, the average logarithms and temporal variations of the partitioning coefficients were well simulated in both Nanjing and Denver. The partitioning of n-alkanes in Nanjing can be primarily explained by the absorption mechanism, while the adsorption mechanism dominates that for n-alkanes in Denver and PAHs in both cities. To obtain an optimal simulation, the poL of n-alkanes and PAHs was estimated using the SPARC and SIMPOL—two group contribution methods, respectively, and the difference between desorption and vaporization enthalpies was set between 2 and 3 kcal mol−1 for n-alkanes in Denver and PAHs in both cities. Therefore, the estimation of poL and surface adsorption should be carefully considered when parameterizing the gas-particle partitioning of non-polar organic compounds in future field and modeling studies.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synchronization of the Recent Decline of East African Long Rains and Northwestern Eurasian Warming 东非长降雨近期减少与欧亚大陆西北部变暖的同步性

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-28 DOI: 10.1029/2024JD041033

Samson Hagos, Chuan-Chieh (Jay) Chang, Po-Lun Ma, Sandro W. Lubis, Karthik Balaguru, Pengfei Shi, Oluwayemi Garuba, L. Ruby Leung

{"title":"Synchronization of the Recent Decline of East African Long Rains and Northwestern Eurasian Warming","authors":"Samson Hagos, Chuan-Chieh (Jay) Chang, Po-Lun Ma, Sandro W. Lubis, Karthik Balaguru, Pengfei Shi, Oluwayemi Garuba, L. Ruby Leung","doi":"10.1029/2024JD041033","DOIUrl":"https://doi.org/10.1029/2024JD041033","url":null,"abstract":"The East African March–April–May (MAM, “long rains”) precipitation decline in recent decades remains a puzzle marked by various proposed large-scale drivers. Here, the interannual variability of the long rains and their recent drying trend are examined using global model simulations and observations. Comparison of a control simulation and re-initialized simulations in which land-surface feedback is suppressed shows that much of the long rains deficit experienced between 1980 and 2014 is synchronized with the warming of the Northwestern Eurasian landmass. In agreement with the modeling results, multiple observational data sets reveal a strong negative correlation between MAM mean East African rainfall amount and the surface temperature over Northwestern Eurasia. Idealized simulations further indicate that warming in Northwestern Eurasia weakens the regional Hadley Cell and diverts the monsoonal transport of moisture away from Eastern Africa toward Europe and southern Africa, highlighting the role of remote land surface warming on the observed precipitation decline.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD041033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decadal Relationship Between Arctic SAT and AMOC Changes Modulated by the North Pacific Oscillation 北太平洋涛动调节的北极 SAT 和 AMOC 十年变化关系

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-28 DOI: 10.1029/2024JD041577

Bowen Zhao, Pengfei Lin, Hailong Liu, Aixue Hu, Xiaolong Chen, Lu Yang

{"title":"Decadal Relationship Between Arctic SAT and AMOC Changes Modulated by the North Pacific Oscillation","authors":"Bowen Zhao, Pengfei Lin, Hailong Liu, Aixue Hu, Xiaolong Chen, Lu Yang","doi":"10.1029/2024JD041577","DOIUrl":"https://doi.org/10.1029/2024JD041577","url":null,"abstract":"The faster warming for Arctic Ocean surface air temperature (SAT) relative to that at lower latitude is connected with various processes, including local radiation feedback, poleward oceanic and atmospheric heat transport. It is unclear how combinations of different low-frequency internal climate modes influence Arctic amplification on the decadal timescale. Here, the decadal Arctic SAT variation, its connection with the Atlantic meridional overturning circulation (AMOC) and possible underlying mechanisms, are investigated based on several independent observational proxies, pre-industrial experiments, and historical large ensembles of two CMIP6 models. Our study suggests that AMOC and Arctic SAT vary in phase on the decadal timescale, whereas this relationship is insignificant at the interannual timescale. Further analysis shows that the AMOC accompanied with cross-basin oceanic water/heat transport between Atlantic and Arctic would alter air–sea interface exchange over the melting ice regions, and then amplified poleward atmospheric heat and moisture transports. The resulting enhanced downward longwave radiation ultimately warms the Arctic SAT. Additionally, the decadal-scale North Pacific Oscillation (NPO) can modulate the relationship between AMOC and Arctic SAT by influencing poleward moisture transport and cross-basin circulation. Specifically, the phase shift of combined NPO and AMOC can contribute 14%–41% covariance relationship between AMOC and Arctic SAT. Our study provides potential sources for predicting the Arctic climate and constraining its uncertainty in future projections.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Do Subsampling Strategies Reduce the Confounding Effect of Errors in Bispectral Retrievals on Estimates of Aerosol Cloud Interactions? 子取样策略能否减少双光谱检索误差对气溶胶云相互作用估算的混杂效应？

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-27 DOI: 10.1029/2023JD040189

J. R. Loveridge, L. Di Girolamo

{"title":"Do Subsampling Strategies Reduce the Confounding Effect of Errors in Bispectral Retrievals on Estimates of Aerosol Cloud Interactions?","authors":"J. R. Loveridge, L. Di Girolamo","doi":"10.1029/2023JD040189","DOIUrl":"https://doi.org/10.1029/2023JD040189","url":null,"abstract":"Bi-spectral retrievals of droplet effective radius and cloud optical depth are widely utilized to estimate aerosol cloud interactions (ACI) in warm clouds in the marine boundary layer. Here, we assess the effect of retrieval errors due to the neglect of 3D radiative transfer during the retrieval process on this analysis of ACI. We use an ensemble of stochastically-modeled cloud fields and 3D radiative transfer simulations to study the retrieval errors at a solar zenith angle of 30°. Simulated retrieval biases in droplet number concentration (Nd) for all three MODIS channels vary systematically from +35% to −80% as cloud heterogeneity increases. Pixel-level errors can be much larger. Commonly utilized subsampling strategies do not reduce the systematic variation in retrieval error. Negative error correlations between optical depth and droplet effective radius produce spuriously negative slopes between the logarithm of liquid water path and Nd (−1.0 to −0.3). Pixels at the center of (8 km)2 patches that are not overcast have a relative bias in Nd of −50%. The relative frequency of these biased pixels varies linearly with the clear fraction in MODIS data and form the basis for a simple parameterization of Nd bias that varies with cloud fraction (CF). Using this parameterization, synthetic data experiments indicate that estimates of the first indirect effect in the tropical ocean can be overestimated by up to 30%, and the effect of aerosol on CF is overestimated by 50%, due to neglecting the correlation between retrieval errors and cloud microphysics.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JD040189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142328455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Disentangling the Impacts of Environmental Factors on Evaporative Fraction Across Climate Regimes 厘清不同气候条件下环境因素对蒸发分量的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-27 DOI: 10.1029/2024JD041515

Qiong Han, Tiejun Wang, Zhe Kong, Yibin Dai, Lichun Wang

{"title":"Disentangling the Impacts of Environmental Factors on Evaporative Fraction Across Climate Regimes","authors":"Qiong Han, Tiejun Wang, Zhe Kong, Yibin Dai, Lichun Wang","doi":"10.1029/2024JD041515","DOIUrl":"https://doi.org/10.1029/2024JD041515","url":null,"abstract":"Evaporative fraction (EF) is a useful measure for quantifying land surface energy partitioning processes and determining evaporative regimes; however, its influencing factors remain highly uncertain. Here, global data sets were compiled to disentangle the effects of environmental variables on EF variations along climate and land surface gradients. We found that (a) at annual timescales, ecosystem-level EF could be expressed as a power law function of aridity index. The relationships of mean annual soil water content (SWC) and leaf area index (LAI) with mean annual EF resembled the traditional evaporative regime theory; (b) at daily timescales, the boosted regression tree method quantitatively revealed that the impacts of environmental variables (including meteorological variables) on EF showed equal importance, especially at humid sites, primarily due to the different response direction and magnitude of latent heat (LE) and sensible heat (H) fluxes to environmental changes. Particularly, the contrasting responses of LE (positive) and H (negative) to SWC, LAI, and relative humidity enhanced the positive effects of those influencing variables on EF; whereas, the correlations between EF and energy-related factors (i.e., net radiation-Rn and air temperature-Ta) deteriorated as both LE and H showed positive response patterns to those variables; (c) meteorological factors were also found to have nonlinear effects on daily EF, further modified by climatic conditions. Rn near 150 W/m2 and Ta near 15°C appeared to be important energy-partitioning thresholds at drier and humid sites, respectively. Moreover, changing interactions among environmental variables with climates were demonstrated to be important for better explaining EF variations.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142328453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observing a Volatile Organic Compound From a Geostationary Infrared Sounder: HCOOH From FengYun-4B/GIIRS 从地球静止红外探测器观测挥发性有机化合物：来自风云-4B/GIIRS 的 HCOOH

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-27 DOI: 10.1029/2024JD041352

Zhao-Cheng Zeng, Bruno Franco, Lieven Clarisse, Lu Lee, Chengli Qi, Feng Lu

引用次数: 0

Different Modulations of Arctic Oscillation on Wintertime Sea Surface Temperature Anomalies in the Northeast Pacific 北极涛动对东北太平洋冬季海面温度异常的不同影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-26 DOI: 10.1029/2024JD041360

Jiajie Chen, Ronglin Li, Jiongren Mao, Weihao Yu, Shen Xie, Jiaqi Wei, Hao Huang, Qinyu Liu, Jian Shi

{"title":"Different Modulations of Arctic Oscillation on Wintertime Sea Surface Temperature Anomalies in the Northeast Pacific","authors":"Jiajie Chen, Ronglin Li, Jiongren Mao, Weihao Yu, Shen Xie, Jiaqi Wei, Hao Huang, Qinyu Liu, Jian Shi","doi":"10.1029/2024JD041360","DOIUrl":"https://doi.org/10.1029/2024JD041360","url":null,"abstract":"Persistent positive sea surface temperature anomalies (SSTAs) in the mid-latitude Northeast Pacific (NEP), also known as “warm blob” or “marine heatwave,” have substantial ecological and climate effects. This study delves into the spatiotemporal connection between Arctic Oscillation (AO) and SSTAs in the NEP. First, we conduct the lead-lag correlation and maximum covariance analyses to disentangle the closest temporal relationship between October AO and wintertime SSTAs in the NEP. Then, we categorize the years in positive AO (pAO) phase into two groups: positive AO with warm anomaly (pAO&Blob) group and positive AO without warm anomaly (pAO&noBlob) group based on the October AO index and wintertime blob index. Results show that the positive phase of AO in October strongly influences the wintertime warm SSTAs in the NEP through local and remote pathways. The local pathway is contingent upon the longitudinal positioning of AO-related high-pressure anomaly (i.e., anomalous ridge) in the North Pacific. When easterly anomalies prevail at the southern flank of the anomalous ridge over the NEP, they foster warm SSTAs in the NEP. However, different locations of the high-pressure anomalies may impede the NEP warming. Remote pathways indicate the teleconnections triggered by AO-related precipitation increase in Greenland and decrease in East Asia, sustaining the high-pressure anomaly and promoting the anomalous NEP warming. Hence, this study presents new evidence on polar and mid-latitude climate connections, which may provide potential predictability for the warm SSTAs in the NEP.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0