ENSO對(duì)冬季北太平洋水汽輸送及大氣河的影響

doi:10.12306/2019jms.0044

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ENSO對(duì)冬季北太平洋水汽輸送及大氣河的影響
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                        10.12306/2019jms.0044
                    
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中圖分類號(hào):P434
基金項(xiàng)目:國家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目（2018YFC1505903）；國家自然科學(xué)基金資助項(xiàng)目（41675067）

The impact of ENSO on vapor transportation and atmospheric rivers over North Pacific during winters

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摘要:

利用1979—2016年ERA-Interim再分析資料，分析了ENSO對(duì)冬季北太平洋地區(qū)水汽輸送特征的影響，包括整層水汽含量、整層水汽輸送及其散度和大氣河頻率。結(jié)果表明，在El Niño年冬季，東北太平洋地區(qū)的氣旋式環(huán)流異常增強(qiáng)了自副熱帶太平洋向北美西海岸的水汽輸送，導(dǎo)致區(qū)域性的水汽輻合與輻散異常；La Niña年冬季的水汽輸送特征與厄爾尼諾年大致相反。根據(jù)尺度分解的方法，對(duì)水汽輸送及其散度的異常成因進(jìn)行分析，得到結(jié)論如下：除El Niño年黑潮及其續(xù)流區(qū)外，ENSO年冬季北太平洋的水汽輸送異常主要由環(huán)流異常導(dǎo)致；水汽輸送散度異常則主要由環(huán)流異常的散度、氣候態(tài)比濕的經(jīng)向梯度和異常比濕的緯向梯度三部分決定。此外，El Niño年冬季北太平洋大氣河頻率分布的向極彎曲增強(qiáng)，分布更加集中；而La Niña年冬季大氣河頻率分布更加分散，緯向跨度減小，經(jīng)向跨度增加。

Abstract:

The impact of ENSO on the vapor transportation characteristics over the North Pacific in boreal winters during 1979 to 2016 was investigated with ERA-Interim reanalysis data, including the Integrated Water Vapor (IWV), Integrated Vapor Transport (IVT) and its divergence, as well as the Atmospheric River (AR) frequency. During El Niño boreal winters, the vapor transportation from the subtropical Pacific to the west coast of North America is intensified with cyclonic circulation anomalies over the Northeast Pacific, causing corresponding regional convergent and divergent anomalies. During La Niña boreal winters, the characteristics of vapor transportation are roughly opposite to those of El Niño cases. Analysis of contributing factors on IVT and its divergence is performed based on the scale decomposition method, and the conclusions are as follows: IVT anomalies in ENSO winters over the North Pacific are primarily decided by the circulation anomalies except for the Kuroshio-Oyashio Extension (KOE) region in El Niño winters. IVT divergence anomalies are mainly contributed by the divergent circulation anomalies, the meridional gradient of climatological specific humidity, and the zonal gradient of anomalous specific humidity. Furthermore, the AR distribution is more centralized and anomalously shifted poleward in El Niño winters, while more decentralized with a wide meridional and limited zonal range in La Niña winters over the North Pacific.

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游振宇,劉世淦,王軒同,任雪娟. ENSO對(duì)冬季北太平洋水汽輸送及大氣河的影響.氣象科學(xué),2021,41(1):70-77 YOU Zhenyu, LIU Shigan, WANG Xuantong, REN Xuejuan. The impact of ENSO on vapor transportation and atmospheric rivers over North Pacific during winters. Journal of the Meteorological Sciences,2021,41(1):70-77

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收稿日期:2019-06-04
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在線發(fā)布日期: 2021-03-20
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