Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0189.1 |
Contributions of Climate Feedbacks to Changes in Atmospheric Circulation | |
Ceppi, Paulo; Shepherd, Theodore G. | |
2017-11-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:22 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The projected response of the atmospheric circulation to the radiative changes induced by CO2 forcing and climate feedbacks is currently uncertain. In this modeling study, the impact of CO2-induced climate feedbacks on changes in jet latitude and speed is assessed by imposing surface albedo, cloud, and water vapor feedbacks as if they were forcings in two climate models, CAM4 and ECHAM6. The jet response to radiative feedbacks can be broadly interpreted through changes in midlatitude baroclinicity. Clouds enhance baroclinicity, favoring a strengthened, poleward-shifted jet; this is mitigated by surface albedo changes, which have the opposite effect on baroclinicity and the jet, while water vapor has opposing effects on upper-and lower-level baroclinicity with little net impact on the jet. Large differences between the CAM4 and ECHAM6 responses illustrate how model uncertainty in radiative feedbacks causes a large spread in the baroclinicity response to CO2 forcing. Across the CMIP5 models, differences in shortwave feedbacks by clouds and albedo are a dominant contribution to this spread. Forcing CAM4 with shortwave cloud and albedo feedbacks from a representative set of CMIP5 models yields a wide range of jet responses that strongly correlate with the meridional gradient of the anomalous shortwave heating and the associated baroclinicity response. Differences in shortwave feedbacks statistically explain about 50% of the intermodel spread in CMIP5 jet shifts for the set of models used, demonstrating the importance of constraining radiative feedbacks for accurate projections of circulation changes. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416488200014 |
WOS关键词 | WATER-VAPOR FEEDBACK ; LOW-CLOUD COVER ; EDDY-DRIVEN JET ; POLAR AMPLIFICATION ; SOUTHERN-HEMISPHERE ; RELATIVE-HUMIDITY ; RADIATIVE CHANGES ; POLEWARD SHIFT ; HIGH-LATITUDES ; OPTICAL DEPTH |
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/20260 |
专题 | 气候变化 |
作者单位 | Univ Reading, Dept Meteorol, Reading, Berks, England |
推荐引用方式 GB/T 7714 | Ceppi, Paulo,Shepherd, Theodore G.. Contributions of Climate Feedbacks to Changes in Atmospheric Circulation[J]. JOURNAL OF CLIMATE,2017,30(22). |
APA | Ceppi, Paulo,&Shepherd, Theodore G..(2017).Contributions of Climate Feedbacks to Changes in Atmospheric Circulation.JOURNAL OF CLIMATE,30(22). |
MLA | Ceppi, Paulo,et al."Contributions of Climate Feedbacks to Changes in Atmospheric Circulation".JOURNAL OF CLIMATE 30.22(2017). |
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