利用MODIS跟踪监测一个冷涡对海洋表层生物光学参数的影响

发布时间：2018-06-20 09:22

本文选题：中尺度涡 + 水色遥感　；参考：《热带海洋学报》2016年03期

【摘要】：研究中尺度涡对海洋上层生物地球化学过程的影响已经得到越来越多的关注,水色遥感作为一个重要的工具可以为此提供大时空尺度的数据来源。基于南海区域性生物光学反演算法,对2007年1月底发源于吕宋海峡西南侧的一个冷涡进行跟踪监测。在冷涡生成初期,涡旋携带吕宋海峡高营养高生物量海水向西北方向移动,内部叶绿素a(Chl a)保持高浓度。冷涡停留期间(长达一个月),在涡致抽吸的持续作用下,冷涡内Chl a浓度由0.26mg×m~(-3)增长到0.33mg×m~(-3);而进入春季,涡旋外的Chl a浓度则由0.24mg×m~(-3)减小到0.15mg×m~(-3);颗粒有机碳(POC)浓度、浮游植物吸收系数(a_(ph(443)))、漫射衰减系数(K_(d(490)))与Chl a浓度的变化一致,而POC∶Chl a和微微型浮游植物所占的比例(F_p)则表现出与Chl a浓度相反的趋势。冷涡西移期间,随着涡致抽吸强度的降低及所携带的营养物质被不断消耗,涡内部Chl a浓度、POC浓度、a_(ph(443))、K_(d(490))逐渐降低,POC∶Chl a和F_p逐渐升高。结果表明,在平流作用和涡致抽吸共同作用下,冷涡所引起的光学响应可以用来帮助识别和跟踪涡旋。
[Abstract]:More and more attention has been paid to the effects of mesoscale vortices on the biogeochemical processes in the upper ocean. As an important tool, water color remote sensing can provide a large scale data source for this purpose. Based on the regional bio-optical inversion algorithm in the South China Sea, a cold vortex originated in the southwest of Luzon Strait in late January 2007 was tracked and monitored. In the early stage of cold vortex formation, the vortex moved northwestward with high nutrient and high biomass seawater in Luzon Strait, and kept high concentration of chlorophyll a Chl a in the interior. During the stay of cold vortex (up to one month), the concentration of Chla in cold vortex increased from 0.26mg 脳 mechi-3 to 0.33mg 脳 mnc-3, and in spring, the concentration of Chla outside the vortex decreased from 0.24mg 脳 mGM-3 to 0.15mg 脳 m-3; the concentration of particulate organic carbon (POC) was reduced to the concentration of POCs. The absorption coefficient of phytoplankton and the diffuse attenuation coefficient are consistent with the change of Chla concentration, while the proportion of POC: Chl a and picoplankton is opposite to that of Chla concentration. During the westward migration of the cold vortex, with the decrease of the vortex-induced suction intensity and the consumption of the nutrients carried, the concentration of POC in the vortex increases gradually, and the concentration of POC in the vortex increases gradually. The results show that the optical response induced by cold vortices can be used to identify and track vortices under the interaction of advection and vortex-induced pumping.
【作者单位】：热带海洋环境国家重点实验室(中国科学院南海海洋研究所);中国科学院大学;
【基金】：国家自然科学基金项目(41376042、41176035) 深圳市科技计划项目(JSGG20130923093840265) 国家青年科学基金项目(41206029) 中国科学院南海海洋研究所青年人才基金(SQ201102) 中科院先导专项(XDA11040302)~~
【分类号】：P733.3

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