Impact of Temperature on Absorption Coefficient of Pure Seawater in the Blue Wavelengths Inferred from Satellite and In Situ Measurements

作     者：Guomei Wei Zhongping Lee Xiuling Wu Xiaolong Yu Shaoling Shang Ricardo Letelier 

作者机构：State Key Laboratory of Marine Environmental ScienceCollege of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Research and Development Center for Ocean Observation TechnologiesXiamen UniversityXiamen 361102China School for the EnvironmentUniversity of Massachusetts BostonBostonMA 02125USA College of EarthOcean&Atmospheric SciencesOregon State UniversityCorvallisOR 97331USA 

出 版 物：《Journal of Remote Sensing》 (国际遥感学报（英文）)

年 卷 期：2021年第2021卷第1期

页      面：289-301页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1002[医学-临床医学] 07[理学] 0707[理学-海洋科学] 0708[理学-地球物理学] 0816[工学-测绘科学与技术] 

基　　金：support provided by the National Natural Science Foundation of China(#41890803,#41941008,and#41830102) the Joint Polar Satellite System(JPSS)funding for the NOAA ocean color calibration and validation(Cal/Val)project(SA18-UMB01) the University of Massachusetts Boston is greatly appreciated NASA OBPG for processing and providing global MODIS ocean color data and the Hawaii Ocean Time-series HOT-DOGS application(University of Hawai’i at Mānoa,National Science Foundation Award#1756517)for data collection and sharing。 

主　　题：salinity ocean coefficient 

摘      要：There has been a long history of interest on how(if)the absorption coefficient of“purefresh water(a_(fw)(λ))and“pureseawater(a_(sw)(λ))changes with temperature(T),yet the impact of T reported in the literature differs significantly in the blue domain.Unlike the previous studies based on laboratory measurements,we took an approach based on~18 years(2002–2020)of MODIS ocean color and temperature measurements in the oligotrophic oceans,along with field measured chlorophyll concentration and phytoplankton absorption coefficient,to examine the relationship between T and the total absorption coefficient(a(λ))at 412 and 443 nm.We found that the values of a(412)and a(443)in the summer are nearly flat(slightly decreasing)for the observed T range of~19–27℃.Since there are no detectable changes of chlorophyll during this period,the results suggest that T has a negligible impact on a_(sw)(412) and a_(sw)(443)in this T range.As a complement,the impact of salinity on a_(fw)(λ) was also evaluated using three independent determinations of a_(sw)(λ) and a_(fw)(λ),where good agreements were found from these observations.