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DOI | 10.1002/joc.6262 |
Relationships of West Greenland supraglacial melt-lakes with local climate and regional atmospheric circulation | |
Rowley, Nathan A.1; Carleton, Andrew M.2,3; Fegyveresi, John4 | |
2019-08-22 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | Along the west-central Greenland ice sheet (GrIS) ablation zone, the time of annual maximum occurrence of surface melt-lakes, or peak lake period (PLP) averages June 18-July 3. This study combines atmospheric reanalysis and automatic weather station data from the Greenland Climate Network to assess the roles of synoptic circulation patterns and local climate variables, respectively, in the total melt-lake area and count in the Sermeq Kujalleq ablation region (SKAR) for the PLPs of 2000-2016. Melt-lake information is obtained from analysis of Landsat-7 images. Two surface climate parameters (e.g., temperature, incoming shortwave radiation) having a strong combined effect on melt-lake area in the SKAR are the June mean temperature, and May mean incoming solar radiation (r = .96). Incorporating the May insolation into a regression equation permits predictability of total melt-lake area for the study area into late June. June months classified as high melt correlate regionally with mid-tropospheric ridging, warm air advection, and reduced cloud cover, while low melt June months are associated with a trough, cold advection, and greater cloud amount. A localized feature that we found to be prevalent during the high-melt years are piteraq, or downsloping winds, which provide additional warming to the SKAR from adiabatic compression. Atmospheric circulation indices comprising the North Atlantic Oscillation index (NAOI) teleconnection and Greenland blocking index (GBI) pattern augment the reanalysis gridded data. We find statistically significant correlations of the NAOI and GBI with melt-lake area (r = -.62 and r = .77, respectively). The correlations with melt-lake count however, are not significant; greater combined lake area and count tend to accompany the meridional mode of high amplitude Rossby waves and/or anti-cyclonic blocking in the Greenland sector. Determining the local and synoptic-scale atmospheric controls on supraglacial lake variability helps clarify the role of climate in the surface hydrology of the GrIS. |
英文关键词 | Greenland blocking index North Atlantic Oscillation polar supraglacial melt-lakes |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000482869400001 |
WOS关键词 | NORTH-ATLANTIC OSCILLATION ; MCMURDO DRY VALLEYS ; ICE-SHEET ; ABLATION ZONE ; FOEHN WINDS ; VARIABILITY ; VELOCITY ; BALANCE ; JAKOBSHAVN ; EVOLUTION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186112 |
专题 | 气候变化 |
作者单位 | 1.Ohio Wesleyan Univ, Dept Geol & Geog, Delaware, OH 43015 USA; 2.Penn State Univ, Dept Geog, Univ Pk, State Coll, PA USA; 3.Penn State Univ, Polar Ctr, Univ Pk, State Coll, PA USA; 4.No Arizona Univ, Sch Earth & Sustainabil, Flagstaff, AZ 86011 USA |
推荐引用方式 GB/T 7714 | Rowley, Nathan A.,Carleton, Andrew M.,Fegyveresi, John. Relationships of West Greenland supraglacial melt-lakes with local climate and regional atmospheric circulation[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019. |
APA | Rowley, Nathan A.,Carleton, Andrew M.,&Fegyveresi, John.(2019).Relationships of West Greenland supraglacial melt-lakes with local climate and regional atmospheric circulation.INTERNATIONAL JOURNAL OF CLIMATOLOGY. |
MLA | Rowley, Nathan A.,et al."Relationships of West Greenland supraglacial melt-lakes with local climate and regional atmospheric circulation".INTERNATIONAL JOURNAL OF CLIMATOLOGY (2019). |
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