Annals of Glaciology最新文献_第5页

A tale of two events: Arctic rain-on-snow meteorological drivers 两个事件的故事：北极雨对雪的气象驱动因素

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-05-10 DOI: 10.1017/aog.2023.25

Jessica Voveris, M. Serreze

{"title":"A tale of two events: Arctic rain-on-snow meteorological drivers","authors":"Jessica Voveris, M. Serreze","doi":"10.1017/aog.2023.25","DOIUrl":"https://doi.org/10.1017/aog.2023.25","url":null,"abstract":"\u0000 Arctic rain-on-snow (ROS) events can have significant impacts on Arctic wildlife and socio-economic systems. This study addresses the meteorology of two different Arctic ROS events. The first, occurring near Nuuk, Greenland, generated significant impacts, including slush avalanches. The second, less severe, event occurred within the community of Iqaluit, Nunavut, Canada. This research utilizes atmospheric reanalysis, automated surface observation station data and atmospheric soundings to determine the meteorological conditions driving these events and the differences between each case. In both cases, atmospheric blocking played a leading role in ROS initiation, with atmospheric rivers – narrow bands of high water vapor transport, typically originating from the tropics and subtropics – having both direct and indirect effects. Cyclone-induced low-level jets and resultant ‘warm noses’ of higher air temperatures and moisture transport were other key features in ROS generation. To our knowledge, our study is the first to visualize how the varying strength and manifestation of these coupled features contribute to differences in the severity of Arctic ROS events. The meteorological drivers identified here find support from other studies on Arctic ROS events and are similar to weather features associated with Arctic precipitation events of extreme magnitude.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42465113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

The bimodality of the East Siberian fast ice extent: mechanisms and changes 东西伯利亚快冰范围的双峰性:机制和变化

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-05-08 DOI: 10.1017/aog.2023.22

V. Selyuzhenok, T. Krumpen, D. Demchev, R. Gerdes, C. Haas

{"title":"The bimodality of the East Siberian fast ice extent: mechanisms and changes","authors":"V. Selyuzhenok, T. Krumpen, D. Demchev, R. Gerdes, C. Haas","doi":"10.1017/aog.2023.22","DOIUrl":"https://doi.org/10.1017/aog.2023.22","url":null,"abstract":"\u0000 Using operational sea-ice maps, we provide first insight into the seasonal evolution of fast ice in the East Siberian Sea for the period between 1999 and 2021. The fast ice season tends to start later by 4.7 d per decade and to end earlier by 9.7 d per decade. As a result, there is a trend towards a shorter length of fast ice season by 2 weeks per decade. The analysis of air temperatures indicates that onset and end of the fast ice season are largely driven by thermodynamic processes. Two spatial modes (large, L-mode and small, S-mode) of East Siberian fast ice cover which have significant areal differences were distinguished. The occurrence of L- and S-modes was linked to the polarity of the Arctic Oscillation (AO) index. Negative AO phase leads to increased sea-ice convergence in the region, which in turn favours sea-ice grounding and promotes the development of large fast ice extent (L-mode). Lower deformation rates in the region during positive AO phase does not allow the formation of grounded features which results in small fast ice extent (S-mode). An analysis of sea-ice divergence confirms that L-mode seasons are characterised by higher on-shore convergence compared with S-mode seasons.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44677574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Change at 85 degrees south: Shackleton Glacier region proglacial lakes from 1960 to 2020 南纬85度的变化:1960年至2020年沙克尔顿冰川地区原冰期湖泊

4区地球科学

Annals of Glaciology Pub Date : 2023-05-05 DOI: 10.1017/aog.2023.27

Melisa A. Diaz, Christopher B. Gardner, David H. Elliot, Byron J. Adams, W. Berry Lyons

引用次数: 0

CHANGE AT 85 DEGREES SOUTH: SHACKLETON GLACIER REGION PROGLACIAL LAKES FROM 1960 TO 2020 南纬85度的变化:1960年至2020年沙克尔顿冰川地区原冰川湖泊

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-05-05 DOI: 10.1130/abs/2020am-359713

Melisa A. Diaz, C. Gardner, D. Elliot, B. Adams, W. Lyons

引用次数: 1

Quantifying dissolution rates of Antarctic icebergs in open water 量化南极冰山在开放水域的溶解速率

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-05-03 DOI: 10.1017/aog.2023.26

O. Orheim, A. B. Giles, T. H. Jacka, G. Moholdt

{"title":"Quantifying dissolution rates of Antarctic icebergs in open water","authors":"O. Orheim, A. B. Giles, T. H. Jacka, G. Moholdt","doi":"10.1017/aog.2023.26","DOIUrl":"https://doi.org/10.1017/aog.2023.26","url":null,"abstract":"\u0000 At any one time 130 000 icebergs are afloat in the Southern Ocean; 97% of these are too small to be registered in current satellite-based databases, yet the melting of these small icebergs provides a major input to the Southern Ocean. We use a unique set of visual size observations of 53 000 icebergs in the South Atlantic Ocean, the SCAR International Iceberg Database, to derive average iceberg dissolution rates. Fracture into two parts is the dominant dissolution process for tabular icebergs, with an average half-life of 30 days for icebergs <4 km length and 60 days for larger icebergs. Complete shatter producing many icebergs <1 km length is rare. A side attrition rate of 0.23 m d−1 combined with drift speed of 6 km d−1, or any proportional change in both numbers fits the observed changes in iceberg distribution. The largest injection into the Southern Ocean of fresh water and any iceberg-transported material takes place in a ~2.3 × 10⁶ km2 zone extending east-northeast from the Antarctic Peninsula to the Greenwich meridian. The iceberg contribution to salinities and temperatures, with maximum contribution north of the Weddell Sea, differs in some regions, from those indicated by tracking large icebergs.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46889963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

The effect of low temperature on the Raman spectra of calcium-rich sulfates on Mars 低温对火星上富钙硫酸盐拉曼光谱的影响

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-05-03 DOI: 10.1017/aog.2023.29

J. Huidobro, J. Aramendia, G. Arana, E. Hausrath, J. Madariaga

引用次数: 0

Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream – CORRIGENDUM 东北格陵兰冰流起始区的床地形和冰下地貌-勘误表

4区地球科学

Annals of Glaciology Pub Date : 2023-04-26 DOI: 10.1017/aog.2023.33

Steven Franke, Daniela Jansen, Tobias Binder, Nils Dörr, Veit Helm, John Paden, Daniel Steinhage, Olaf Eisen

引用次数: 0

Deriving a year 2000 glacier inventory for New Zealand from the existing 2016 inventory 从现有的2016年冰川清单中得出新西兰2000年的冰川清单

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-04-20 DOI: 10.1017/aog.2023.20

F. Paul, S. Baumann, B. Anderson, P. Rastner

{"title":"Deriving a year 2000 glacier inventory for New Zealand from the existing 2016 inventory","authors":"F. Paul, S. Baumann, B. Anderson, P. Rastner","doi":"10.1017/aog.2023.20","DOIUrl":"https://doi.org/10.1017/aog.2023.20","url":null,"abstract":"\u0000 Due to adverse snow and cloud conditions, only a few inventories are available for the maritime glaciers in New Zealand. These are difficult to compare as different approaches and baseline data have been used to create them. In consequence, glacier fluctuations in New Zealand over the past two decades are only known for a few glaciers based on field observations. Here we present the results of a new inventory for the ‘year 2000’ (some scenes are from 2001 and 2002) that is based on glacier outlines from a recently published inventory for the year 2016 and allowed consistent change assessment for nearly 3000 glaciers over this period. The year 2000 inventory was created by manual on-screen digitizing using Landsat ETM+ satellite imagery (15 m panchromatic band) in the background and the year 2016 outlines as a starting point. Major challenges faced were late and early seasonal snow, clouds and shadow, the geo-location mismatch between Landsat and Sentinel-2 as well as the correct interpretation of ice patches and ice under debris cover. In total, we re-mapped 2967 glaciers covering an area of 885.5 km2 in 2000, which is 91.7 km2 (or 10.4%) more than the 793.8 km2 mapped in 2016. Area change rates (mean rate −0.65% a−1) increase towards smaller glaciers. Strongest area loss from 2000 to 2016 occurred at elevations ~1900 m but the highest relative loss was found below 800 m a.s.l. In total, 109 glaciers split into two or more entities and 264 had wasted away by 2016.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47542015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Rapid formation and drainage of a new glacial lake in the Monte Rosa Massif, Swiss Alps, as observed on Sentinel-2 imagery 哨兵2号图像显示，瑞士阿尔卑斯山罗莎山新冰川湖的快速形成和排水

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-04-14 DOI: 10.1017/aog.2023.19

A. Pandey, J. Kropáček

引用次数: 0

A decade of in situ cosmogenic 14C in Antarctica 南极洲十年来的原位宇宙成因14C

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-03-27 DOI: 10.1017/aog.2023.13

Keir Alexander Nichols

引用次数: 0