Characteristics of sea surface temperature and Chlorophyll concentration inside mesoscale eddies in the North Pacific Ocean

Xiaoli ZHENG; Qing DONG; Xing FAN

doi:10.11834/jrs.20208215

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Characteristics of sea surface temperature and Chlorophyll concentration inside mesoscale eddies in the North Pacific Ocean
Vol. 24, Issue 1, Pages: 85-96(2020)
Received：15 May 2018，

Published：07 January 2020
DOI： 10.11834/jrs.20208215
稿件说明：

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郑晓莉,董庆,樊星.2020.北太平洋中尺度涡海表温度和叶绿素浓度特征分析.遥感学报,24(1): 85-98 DOI： 10.11834/jrs.20208215.

ZHENG Xiaoli,DONG Qing,FAN Xing. 2020. Characteristics of sea surface temperature and Chlorophyll concentration inside mesoscale eddies in the North Pacific Ocean. Journal of Remote Sensing(Chinese). 24(1): 85-96 DOI： 10.11834/jrs.20208215.

摘要

本文利用AVISO卫星高度计资料识别并追踪了北太平洋2007年—2012年的中尺度涡，并利用OSTIA的海表温度SST(Sea Surface Temperature)资料与MODIS的叶绿素a浓度(Chl-a)资料，研究了北太平洋2007年—2012年中尺度涡SST和Chl-a浓度的时空分布特征，并分析北太平洋典型中尺度涡SST与Chl-a浓度的变化特征，主要结论如下：本文共识别出992个中尺度涡，其中442个气旋涡，550个反气旋涡。中尺度涡SST时空分布特征为：气旋涡温度强度(

)月变化特征比反气旋涡温度强度(

)更强。

年际变化显著，

则不明显。温度强度较强的气旋涡和反气旋涡集中分布在黑潮延伸区。中尺度涡Chl-a浓度时空分布特征如下：气旋涡和反气旋涡Chl-a浓度月变化特征明显，且二者的变化趋势一致；年际变化则均不明显。Chl-a浓度值高的中尺度涡主要分布在高纬海域。中尺度涡SST与海洋动力参数(振幅、涡度和涡动能(EKE))的相互关系为：反气旋涡SST与振幅的相关性亦正亦负，且在空间上均匀分布。气旋涡SST与振幅的负相关系数主要分布在黑潮延伸区。正相关性强的反气旋涡多于气旋涡。反气旋涡SST与涡度的相关性亦正亦负，气旋涡SST与涡度呈负相关。反气旋涡SST与EKE的相关性亦正亦负；气旋涡的相关性为正。中尺度涡Chl-a浓度与海洋动力参数的相互关系为：反气旋涡Chl-a浓度与振幅的相关性为正，且在空间上均匀分布；气旋涡在黑潮延伸区与阿拉斯加湾呈正相关。反气旋涡和气旋涡Chl-a浓度与涡度均呈正相关。反气旋涡Chl-a浓度与EKE呈正相关；气旋涡Chl-a浓度与EKE相关性亦正亦负。

Abstract

Mesoscale eddies are active in the North Pacific Ocean (NPO) sensitive to the global variation of the atmosphere and ocean and directly affect the climate and coastal areas of the country. Therefore

the influence of the mesoscale eddies in the NPO on the marine ecological environment needs to be examined. The relationship between Sea Surface Temperature (SST) and Chlorophyll-a (Chl-a) concentration inside these eddies as well as the response mechanism of these eddies to local ecological processes also warrant further research.

In this paper

the Archiving

Validation

and Interpretation of Satellite Oceanographic data (AVISO)-merged satellite altimeter data are used to identify and track 992 mesoscale eddies in the NPO during the years of 2007-2012

including 442 Cyclonic Eddies (CEs) and 550 Anticyclonic Eddies (AEs)

in the NPO between 2007 and 2012. The spatial and temporal distributions of the SST and the Chl-a concentration inside these eddies are analyzed via Operational Sea surface Temperature and sea Ice Analysis (OSTIA) SST and MODIS data

and the variability of these parameters inside typical eddies is examined.

The results show that the temperature intensity of CEs (

) has a higher tendency to demonstrate monthly variations compared with that of AEs (

). The seasonal variation of

tends to contrast that of

. Specifically

shows an obvious annual variation

whereas

does not. Stronger

and

are observed in the Kuroshio Extension intensively. Both CEs and AEs have similar monthly variation tendencies in the temporal and spatial distributions of eddy Chl-a. The annual trends of Chl-a in both AEs and CEs are ambiguous. For AEs and CEs

the highest Chl-a concentration is observed in the high-latitude region. A study of the relationship between the eddy SST and eddy dynamic parameters (e.g.

amplitude

vorticity

and Eddy Kinetic Energy (EKE)) reveals that SST inner AEs are either positively or negatively correlated to amplitude with a uniform distribution in space. A negative correlation of SST inner CEs can be observed in the Kuroshio Extension

whereas a positive correlation is observed in offshore areas of California. A positive correlation is more frequently observed in AEs than in CEs. The correlation of SST with vorticity in AEs is either positive or negative

while in CEs

SST shows a negative correlation with vorticity. The correlation of SST with EKE in AEs is either positive or negative

but such correlation is only positive uniquely in CEs. The Chl-a concentration in AEs is positively correlated with amplitude and has a uniform distribution in space. In CEs

Chl-a concentration shows a positive correlation with amplitude in the Kuroshio Extension and in Alaska Bay. Chl-a concentration also shows a positive correlation with vorticity in both AEs and CEs

a positive correlation with EKE in AEs

and either a positive or negative correlation with EKE in CEs.

We conclude that SST demonstrates obvious monthly and annual variation tendencies in CEs

and high

and

values are distributed in the Kuroshio Extension of the NPO. The Chl-a concentration in CEs and AEs demonstrate a similar monthly variation tendency and an ambiguous annual variation. Eddies with a high Chl-a concentration are mainly located in the high-latitude region of the NPO. The relationship between the eddy SST and the eddy dynamic parameters is treated as a local feature of the NPO

and a positive relationship between eddy Chl-a concentration and eddy dynamic parameters is observed in the Kuroshio Extension and Alaska Bay. The influence of mesoscale eddies on the ecological processes is related to the type and eddy lifetime of eddies in the NPO.

关键词

Keywords

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