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孟加拉湾及其邻近海域海表日增温的季节变化特征及其机制研究
郭文仪,邱云
0
(自然资源部第三海洋研究所, 福建 厦门 361005;平潭综合实验区气象局,福建 平潭 350400)
摘要:
利用1998―2007年Seaflux资料结合太阳短波辐射及海面风场数据,分析了孟加拉湾海表日增温(Diurnal Warming of Sea Surface Temperature, dSST)的季节变化特征及其形成机制。结果显示,在赤道海域(5.0°N以南),dSST以年周期变化为主并呈现12月至次年5月高、6—11月低的单峰结构,在湾内(5.0°N以北),dSST则表现出显著的半年周期变化而呈现独特的春、秋季高,夏、冬季低的双峰结构。dSST空间分布形态春季呈湾中部高、四周低的态势;秋季湾口较低、湾内及赤道海域较高;夏、冬季形态基本一致均呈赤道高、湾内低的格局,但夏、冬季湾内高值中心略有不同,分别位于斯里兰卡岛东北部近海及湾西边界区。进一步分析表明,海面风速对整个研究海域的影响均较为重要,因此决定了dSST空间分布形态的季节变化。太阳短波辐射对湾内dSST季节变化的影响也较为重要,但在湾口以南至赤道大部分海域的影响较弱。
关键词:  海洋水文学  海表日增温  季节变化  混合层  孟加拉湾
DOI:10.3969/J.ISSN.2095-4972.2021.04.017
基金项目:国家自然科学基金资助项目(42130406,41906013);自然资源部第三海洋研究所基本科研业务费专项资金资助项目(海三科2018001,海三科2018030);全球变化与海气相互作用专项资助项目(GASI-IPOVAI-02,GASI IPOVAI-03)
Seasonal variability and mechanism of sea surface temperature diurnal warming in the Bay of Bengal and its adjacent area
GUO Wenyi,QIU Yun
(Third Institute of Oceanography, MNR, Xiamen 361005, China; Pingtan Meteorological Bureau, Pingtan 350400, China)
Abstract:
Based on the Seaflux dataset from 1998 to 2007, the seasonal variability and formation mechanism of diurnal warming of sea surface temperature (dSST) are revealed in the Bay of Bengal (BOB) and its adjacent area. The results show that dSST varies in annual cycle in the south equatorial area of 5.0°N. The annual cycle presents a single-peak structure and reaches its maxima (minima) from December to May (June to November). The semiannual signal occurs in the north of 5.0°N and presents a unique double-peak structure with lager amplitude in spring and autumn while small amplitude in summer and winter. In spring, the range of dSST is higher in the center of the bay and lower in the surroundings. While dSST is lower in the bay mouth it is higher in the bay center and equatorial region in autumn. In summer and winter the distribution of dSST represents a similar pattern of higher in the equatorial region and lower in the bay, but high value centers show a bit different in the northeast Sri Lanka and western boundary of the bay, respectively. Further analyses show that surface wind is vital over the entire area and determines the seasonal and spatial distribution of dSST. Solar shortwave radiation plays a significant role in the variability of dSST in the BOB, while its effect is weaker in the south of the BOB and most equatorial regions.
Key words:  marine hydrography  diurnal warming of sea surface temperature (dSST)  seasonal variability  mixed layer  the Bay of Bengal

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