SPIE Asia-Pacific Remote Sensing最新文献_第9页

Precipitation-aerosol relationship over the Indian region during drought and excess summer monsoon years 干旱和过度夏季风年期间印度地区降水-气溶胶关系

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2229447

Sajani Surendran, K. Rajendran, Arya V. B.

引用次数: 1

Impact of AWiFS derived land use land cover on simulation of heavy rainfall AWiFS导出的土地利用和土地覆盖对暴雨模拟的影响

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2223627

Srinivasarao Karri, B. Gharai, S. S. Sai Krishna, P. V. Rao

{"title":"Impact of AWiFS derived land use land cover on simulation of heavy rainfall","authors":"Srinivasarao Karri, B. Gharai, S. S. Sai Krishna, P. V. Rao","doi":"10.1117/12.2223627","DOIUrl":"https://doi.org/10.1117/12.2223627","url":null,"abstract":"Land use/land cover (LU/LC) changes are considered to be one of the most important factors affecting regional climate and are thus an area of public concern. The land surface plays a crucial role in boundary layer evolution and precipitation patterns thereby establishing the need for LU/LC inputs as a critical part of modeling systems. Inaccurate LU/LC information often leads to very large errors in surface energy fluxes thus leading to errors in boundary layer state. We have investigated an incident of heavy rainfall during August 2015 over West Bengal, India using Weather Research and Forecast (WRF) model by incorporating different LU/LC datasets, IRS P6 Advanced Wide Field Sensor (AWiFS) LU/LC data for 2012-13 and the default Moderate Resolution Imaging Spectro-radiometer (MODIS) derived USGS LU/LC data for 2001. In the present study, we have made a comparative assessment between AWiFS derived LU/LC and USGS LU/LC by incorporating these datasets as one of the lower boundary conditions over Indian region in WRF model version 3.5.1 to simulate, at 10km resolution, a heavy rainfall event associated with landfall of a cyclonic system over West Bengal. The results of the study suggested influence of LU/LC in occurrence of heavy rainfall with WRF model using AWiFS LU/LC showing more realistic simulation as AWiFS LU/LC is more up-to-date and features recent changes in LU/LC over India.","PeriodicalId":165733,"journal":{"name":"SPIE Asia-Pacific Remote Sensing","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131633322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An effort to improve track and intensity prediction of tropical cyclones through vortex initialization in NCUM-global model ncm -全球模式中涡初始化对热带气旋路径和强度预测的改进

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2223431

V. Singh, A. Routray, S. Mallick, J. George, E. Rajagopal

{"title":"An effort to improve track and intensity prediction of tropical cyclones through vortex initialization in NCUM-global model","authors":"V. Singh, A. Routray, S. Mallick, J. George, E. Rajagopal","doi":"10.1117/12.2223431","DOIUrl":"https://doi.org/10.1117/12.2223431","url":null,"abstract":"Tropical cyclones (TCs) have strong impact on socio-economic conditions of the countries like India, Bangladesh and Myanmar owing to its awful devastating power. This brings in the need of precise forecasting system to predict the tracks and intensities of TCs accurately well in advance. However, it has been a great challenge for major operational meteorological centers over the years. Genesis of TCs over data sparse warm Tropical Ocean adds more difficulty to this. Weak and misplaced vortices at initial time are one of the prime sources of track and intensity errors in the Numerical Weather Prediction (NWP) models. Many previous studies have reported the forecast skill of track and intensity of TC improved due to the assimilation of satellite data along with vortex initialization (VI). Keeping this in mind, an attempt has been made to investigate the impact of vortex initialization for simulation of TC using UK-Met office global model, operational at NCMRWF (NCUM). This assessment is carried out by taking the case of a extremely severe cyclonic storm \"Chapala\" that occurred over Arabian Sea (AS) from 28th October to 3rd November 2015. Two numerical experiments viz. Vort-GTS (Assimilation of GTS observations with VI) and Vort-RAD (Same as Vort-GTS with assimilation of satellite data) are carried out. This vortex initialization study in NCUM model is first of its type over North Indian Ocean (NIO). The model simulation of TC is carried out with five different initial conditions through 24 hour cycles for both the experiments. The results indicate that the vortex initialization with assimilation of satellite data has a positive impact on the track and intensity forecast, landfall time and position error of the TCs.","PeriodicalId":165733,"journal":{"name":"SPIE Asia-Pacific Remote Sensing","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121050835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluation of NCMRWF unified model vertical cloud structure with CloudSat over the Indian summer monsoon region NCMRWF统一模式与CloudSat对印度夏季风地区垂直云结构的评价

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2223622

A. Jayakumar, Ashu Mamgain, A. S. Jisesh, S. Mohandas, R. Rakhi, E. Rajagopal

{"title":"Evaluation of NCMRWF unified model vertical cloud structure with CloudSat over the Indian summer monsoon region","authors":"A. Jayakumar, Ashu Mamgain, A. S. Jisesh, S. Mohandas, R. Rakhi, E. Rajagopal","doi":"10.1117/12.2223622","DOIUrl":"https://doi.org/10.1117/12.2223622","url":null,"abstract":"Representation of rainfall distribution and monsoon circulation in the high resolution versions of NCMRWF Unified model (NCUM-REG) for the short-range forecasting of extreme rainfall event is vastly dependent on the key factors such as vertical cloud distribution, convection and convection/cloud relationship in the model. Hence it is highly relevant to evaluate the vertical structure of cloud and precipitation of the model over the monsoon environment. In this regard, we utilized the synergy of the capabilities of CloudSat data for long observational period, by conditioning it for the synoptic situation of the model simulation period. Simulations were run at 4-km grid length with the convective parameterization effectively switched off and on. Since the sample of CloudSat overpasses through the monsoon domain is small, the aforementioned methodology may qualitatively evaluate the vertical cloud structure for the model simulation period. It is envisaged that the present study will open up the possibility of further improvement in the high resolution version of NCUM in the tropics for the Indian summer monsoon associated rainfall events.","PeriodicalId":165733,"journal":{"name":"SPIE Asia-Pacific Remote Sensing","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121251883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Recent results and proposed observing system simulation experiments (OSSE) to link research and operation 最近的研究结果和提出的观测系统模拟实验(OSSE)将研究和操作联系起来

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2223930

M. Masutani

引用次数: 0

Reduction of uncertainty associated with future changes in Indian summer monsoon projected by climate models and assessment of monsoon teleconnections 减少与气候模式预估的印度夏季风未来变化相关的不确定性和季风遥相关的评估

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2229392

K. Rajendran, Sajani Surendran, A. Kitoh, Stella Jes Varghese

引用次数: 4

High resolution land surface response of inland moving Indian monsoon depressions over Bay of Bengal 孟加拉湾上空移动的印度季风低气压的高分辨率地表响应

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2239712

P. Rajesh, Sandeep Pattnaik

{"title":"High resolution land surface response of inland moving Indian monsoon depressions over Bay of Bengal","authors":"P. Rajesh, Sandeep Pattnaik","doi":"10.1117/12.2239712","DOIUrl":"https://doi.org/10.1117/12.2239712","url":null,"abstract":"During Indian summer monsoon (ISM) season, nearly about half of the monsoonal rainfall is brought inland by the low pressure systems called as Monsoon Depressions (MDs). These systems bear large amount of rainfall and frequently give copious amount of rainfall over land regions, therefore accurate forecast of these synoptic scale systems at short time scale can help in disaster management, flood relief, food safety. The goal of this study is to investigate, whether an accurate moisture–rainfall feedback from land surface can improve the prediction of inland moving MDs. High Resolution Land Data Assimilation System (HRLDAS) is used to generate improved land state .i.e. soil moisture and soil temperature profiles by means of NOAH-MP land-surface model. Validation of the model simulated basic atmospheric parameters at surface layer and troposphere reveals that the incursion of high resolution land state yields least Root Mean Squared Error (RMSE) with a higher correlation coefficient and facilitates accurate depiction of MDs. Rainfall verification shows that HRLDAS simulations are spatially and quantitatively in more agreement with the observations and the improved surface characteristics could result in the realistic reproduction of the storm spatial structure, movement as well as intensity. These results signify the necessity of investigating more into the land surface-rainfall feedbacks through modifications in moisture flux convergence within the storm.","PeriodicalId":165733,"journal":{"name":"SPIE Asia-Pacific Remote Sensing","volume":"9882 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130668641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

MODIS sea surface temperature retrievals using different channel combinations and hybrid cloud detection 不同通道组合和混合云探测的MODIS海面温度反演

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2223465

P. Koner, A. Harris

引用次数: 4

Impact of hyperspectral radiance in the simulation of tropical cyclone using NCUM model 高光谱辐射对NCUM模式模拟热带气旋的影响

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2223520

A. Routray, J. George, V. Singh, I. Rani

引用次数: 0

Relation between tropical cyclone heat potential and cyclone intensity in the North Indian Ocean 北印度洋热带气旋热势与气旋强度的关系

SPIE Asia-Pacific Remote Sensing Pub Date : 2016-05-03 DOI: 10.1117/12.2228033

B. Jangir, D. Swain, T. U. Udaya Bhaskar

{"title":"Relation between tropical cyclone heat potential and cyclone intensity in the North Indian Ocean","authors":"B. Jangir, D. Swain, T. U. Udaya Bhaskar","doi":"10.1117/12.2228033","DOIUrl":"https://doi.org/10.1117/12.2228033","url":null,"abstract":"Ocean Heat Content (OHC) plays a significant role in modulating the intensity of Tropical Cyclones (TC) in terms of the oceanic energy available to TCs. TC Heat Potential (TCHP), an estimate of OHC, is thus known to be a useful indicator of TC genesis and intensification. In the present study, we analyze the role of TCHP in intensification of TCs in the North Indian Ocean (NIO) through statistical comparisons between TCHP and Cyclone Intensities (CI). A total of 27 TCs (20 in the Bay of Bengal, and 7 in the Arabian Sea) during the period 2005–2012 have been analyzed using TCHP data from Global Ocean Data Assimilation System (GODAS) model of Indian National Center for Ocean Information Services and cyclone best track data from India Meteorological Department. Out of the 27 cyclones analyzed, 58% (86%) in the Bay (Arabian Sea) have negative correlation and 42% (14%) cyclones have positive correlation between CI and TCHP. On the whole, more than 60% cyclones in the NIO show negative correlations between CI and TCHP. The negative percentage further increases for TCHP leading CI by 24 and 48 hours. Similar trend is also seen with satellite derived TCHP data obtained from National Remote Sensing Center and TC best track data from Joint Typhoon Warming Centre. Hence, it is postulated that TCHP alone need not be the only significant oceanographic parameter, apart from sea surface temperature, responsible for intensification and propagation of TCs in the NIO.","PeriodicalId":165733,"journal":{"name":"SPIE Asia-Pacific Remote Sensing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123770610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5