海表面盛行風(fēng)背景下大氣對(duì)黑潮海洋鋒的響應(yīng)特征

doi:10.3969/2014jms.0037

首頁(yè) > 過(guò)刊瀏覽>2014年第34卷第4期 >355-364. DOI:10.3969/2014jms.0037

海表面盛行風(fēng)背景下大氣對(duì)黑潮海洋鋒的響應(yīng)特征
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                        10.3969/2014jms.0037
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41275094）；國(guó)家重大基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）項(xiàng)目（2012CB955600）；江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目（PAPD）；江蘇省高校“青藍(lán)工程”

Atmospheric response to the sea surface temperature front of Kuroshio over the East China Sea under different prevailing surface winds in spring

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采用一系列高分辨率的衛(wèi)星資料，應(yīng)用高通濾波等方法，研究了春季不同海表面盛行風(fēng)背景下，東海黑潮海洋鋒區(qū)附近的海氣關(guān)系。觀測(cè)分析表明：在東海，春季3種不同海表面盛行風(fēng)條件下海表面溫度與海表面風(fēng)速之間都存在明顯的正相關(guān)關(guān)系，表現(xiàn)為海洋對(duì)大氣的強(qiáng)迫作用。大氣對(duì)海洋鋒的響應(yīng)在3種不同盛行風(fēng)條件下也存在明顯的差異。在西北盛行風(fēng)和東南盛行風(fēng)背景下，即當(dāng)風(fēng)向垂直于海洋鋒由冷側(cè)（暖側(cè)）吹向暖側(cè)（冷側(cè)）時(shí)，海表面風(fēng)的輻散（輻合）出現(xiàn)在海洋鋒上空。同時(shí)，海洋鋒對(duì)海平面氣壓（SLP）、降水和對(duì)流活動(dòng)的影響較弱，表明大氣對(duì)海洋鋒的響應(yīng)主要局限在大氣邊界層內(nèi)。在東北盛行風(fēng)背景下，即當(dāng)風(fēng)平行于海洋鋒時(shí)，在海洋鋒的暖（冷）水側(cè)上空為海表面風(fēng)的輻合（輻散），并與SLP的異常低（高）值相對(duì)應(yīng)，主要雨帶出現(xiàn)在黑潮暖舌上空。無(wú)論從總降水還是層云、對(duì)流降水頻次的空間分布來(lái)看，盛行東北風(fēng)時(shí)，海表面溫度對(duì)其上雨帶的影響最為明顯。分析結(jié)果還表明，在不同盛行風(fēng)背景下，海洋鋒附近的海氣關(guān)系由不同的物理機(jī)制在起主導(dǎo)作用。當(dāng)盛行平行于海洋鋒的東北風(fēng)時(shí)，主要由SLP調(diào)整機(jī)制起作用；而盛行垂直于海洋鋒的西北風(fēng)時(shí)則主要由垂直混合機(jī)制起作用。

Abstract:

A series of high-resolution satellite data is used to investigate the sea-air interaction around the Kuroshio sea surface temperature (SST) front area over the East China Sea under different prevailing surface winds in spring. Results show that a significant positive correlation exists between the SST and the sea surface wind speed under three different kinds of prevailing surface wind, which presents the sea-air forcing. The responses of atmosphere to the SST front over the East China Sea under three different kinds of prevailing surface wind are obviously different. Under the northwest and southeast prevailing surface winds, the wind perpendicular to the SST front moves from the colder (warmer) flank to the warmer (colder) one, sea surface wind diverges (converges) over the SST front. Meanwhile, the weak influence of the SST front on the sea level pressure (SLP), precipitation and convection indicates that the atmospheric responses to the SST front are mainly confined in the atmospheric boundary layer. Under the northeast prevailing surface wind, the sea surface wind parallel to the SST front converges (diverges) over the warmer (colder) flank of the front, corresponding to the low (high) value of SLP anomalies. An obvious rainband extends along the Kuroshio current over the East China Sea. Whether in terms of the total precipitation, or the distribution of stratiform and convective precipitation frequency, SST has the most obvious effects on the occurrence of its above rainband under the northeast prevailing sea surface wind. It is also found that different physical mechanisms are responsible for the air-sea interaction over the SST front under different prevailing surface winds. The SLP adjustment mechanism works when the northeast surface wind parallel to the SST front was prevailing, while the vertical mixing mechanism became the key factor when the northwest surface wind vertical to the SST front was prevailing.

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謝傲,徐海明,徐蜜蜜,馬靜.海表面盛行風(fēng)背景下大氣對(duì)黑潮海洋鋒的響應(yīng)特征.氣象科學(xué),2014,34(4):355-364 XIE Ao, XU Haiming, XU Mimi, MA Jing. Atmospheric response to the sea surface temperature front of Kuroshio over the East China Sea under different prevailing surface winds in spring. Journal of the Meteorological Sciences,2014,34(4):355-364

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收稿日期:2014-01-19
最后修改日期:2014-04-02
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在線發(fā)布日期: 2014-08-29
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