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 

机构地区：[1]State Key Laboratory of Marine Environmental Science,College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China [2]Research and Development Center for Ocean Observation Technologies,Xiamen University,Xiamen 361102,China [3]School for the Environment,University of Massachusetts Boston,Boston,MA 02125,USA [4]College of Earth,Ocean&Atmospheric Sciences,Oregon State University,Corvallis,OR 97331,USA

出　　处：《Journal of Remote Sensing》2021年第1期289-301,共13页国际遥感学报（英文）

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。

摘　　要：There has been a long history of interest on how(if)the absorption coefficient of“pure”fresh water(a_(fw)(λ))and“pure”seawater(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.

关 键 词：SALINITY OCEAN COEFFICIENT 

分 类 号：P73[天文地球—海洋科学]