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DOI | 10.1029/2018JD028540 |
Temporal Characteristics of Cloud Radiative Effects on the Greenland Ice Sheet: Discoveries From Multiyear Automatic Weather Station Measurements | |
Wang, Wenshan1; Zender, Charles S.1; van As, Dirk2,3 | |
2018-10-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:20页码:11348-11361 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Denmark |
英文摘要 | The impact of clouds on Greenland's surface melt is difficult to quantify due to the limited amount of in situ observations. To better quantify cloud radiative effects (CRE), we utilize 29 automatic weather stations and provide the first analysis on seasonal and hourly timescales in both accumulation and ablation zones. Seasonal CRE shows opposing cycles across geographical regions. CRE generally increases during melt season in the north of Greenland, mainly due to longwave CRE enhancement by cloud fraction and liquid water. CRE decreases from May to July and increases afterwards in the middle and south of Greenland, mainly due to strengthened shortwave CRE caused by surface albedo reduction. This finding resolves the contrasting seasonal distributions in previous studies at different Arctic locations. Longwave seasonal cycle also shifts from increasing in the north to decreasing in the south, implying spatial variations in cloud and atmospheric conditions. On hourly timescales, longwave downwelling radiation exhibits a bimodal distribution peaking at similar to -70 W/m(2) (i.e., clear state) and similar to 0 W/m(2) (i.e., cloudy state), suggesting that Greenland alternates between fairly clear and overcast. In the cloudy state, CRE strongly correlates with the combined influence of solar zenith angle and albedo (r = 0.85, p < 0.01) probably because clouds are thick enough for CRE to become saturated. The close relationship between CRE and albedo over dark surfaces suggests a stabilizing feedback: Net CRE is negative at low albedo caused by snow melt and snow metamorphism and thus tends to increase albedo and decelerate surface melt. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000452000300005 |
WOS关键词 | IN-SITU ; SEA-ICE ; SURFACE RADIATION ; ARCTIC CLOUDS ; ALBEDO ; ABSORPTION ; FLUXES ; MODEL |
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/32210 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA; 2.Geol Survey Denmark, Copenhagen, Denmark; 3.Greenland GEUS, Copenhagen, Denmark |
推荐引用方式 GB/T 7714 | Wang, Wenshan,Zender, Charles S.,van As, Dirk. Temporal Characteristics of Cloud Radiative Effects on the Greenland Ice Sheet: Discoveries From Multiyear Automatic Weather Station Measurements[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(20):11348-11361. |
APA | Wang, Wenshan,Zender, Charles S.,&van As, Dirk.(2018).Temporal Characteristics of Cloud Radiative Effects on the Greenland Ice Sheet: Discoveries From Multiyear Automatic Weather Station Measurements.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(20),11348-11361. |
MLA | Wang, Wenshan,et al."Temporal Characteristics of Cloud Radiative Effects on the Greenland Ice Sheet: Discoveries From Multiyear Automatic Weather Station Measurements".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.20(2018):11348-11361. |
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