Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016GL072453 |
Contemporaneous disequilibrium of bio-optical properties in the Southern Ocean | |
Kahru, Mati1; Lee, Zhongping2; Mitchell, B. Greg1 | |
2017-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Significant changes in satellite-detected net primary production (NPP, mgCm(-2)d(-1)) were observed in the Southern Ocean during 2011-2016: an increase in the Pacific sector and a decrease in the Atlantic sector. While no clear physical forcing was identified, we hypothesize that the changes in NPP were associated with changes in the phytoplankton community and reflected in the concomitant bio-optical properties. Satellite algorithms for chlorophyll a concentration (Chl a, mgm(-3)) use a combination of estimates of the remote sensing reflectance Rrs() that are statistically fitted to a global reference data set. In any particular region or point in space/time the estimate produced by the global mean algorithm can deviate from the true value. Reflectance anomaly (RA) is supposed to remove the first-order variability in Rrs() associated with Chl a and reveal bio-optical properties that are due to the composition of phytoplankton and associated materials. Time series of RA showed variability at multiple scales, including the life span of the sensor, multiyear and annual. Models of plankton functional types using estimated Chl a as input cannot be expected to correctly resolve regional and seasonal anomalies due to biases in the Chl a estimate that they are based on. While a statistical model using RA() time series can predict the times series of NPP with high accuracy (R-2=0.82) in both Pacific and Atlantic regions, the underlying mechanisms in terms of phytoplankton groups and the associated materials remain elusive. |
英文关键词 | ocean color remote sensing Southern Ocean primary production remote sensing reflectance phytoplankton |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399762700026 |
WOS关键词 | PHYTOPLANKTON GROUPS ; CASE-1 WATERS ; COLOR ; CHLOROPHYLL ; ALGORITHM ; SEAWIFS ; SPACE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27425 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; 2.Univ Massachusetts, Sch Environm, Boston, MA 02125 USA |
推荐引用方式 GB/T 7714 | Kahru, Mati,Lee, Zhongping,Mitchell, B. Greg. Contemporaneous disequilibrium of bio-optical properties in the Southern Ocean[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(6). |
APA | Kahru, Mati,Lee, Zhongping,&Mitchell, B. Greg.(2017).Contemporaneous disequilibrium of bio-optical properties in the Southern Ocean.GEOPHYSICAL RESEARCH LETTERS,44(6). |
MLA | Kahru, Mati,et al."Contemporaneous disequilibrium of bio-optical properties in the Southern Ocean".GEOPHYSICAL RESEARCH LETTERS 44.6(2017). |
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