Satellite remote sensing of space-time plankton variability in the Bay of Bengal: Connections to cholera outbreaks

REMOTE SENSING OF ENVIRONMENT

卷:123

Article

Jutla, Antarpreet S.²  Islam, Shafiqul^1,3 

[1] Tufts Univ, Dept Civil & Environm Engn, WeReason Water & Environm Res Educ & Actionable S, Medford, MA 02155 USA

[2] NOAA, Oceans & Human Hlth Initiat, Silver Spring, MD 20910 USA

[3] Tufts Univ, Fletcher Sch Law & Diplomacy, Medford, MA 02155 USA

关键词: Cholera;    Chlorophyll;    Phytoplankton;    Remote sensing;    SeaWIFS;    Spatial and temporal;    Variability;    Variogram;    Coastal hydrology;   

DOI  :  10.1016/j.rse.2012.03.005

来源: Elsevier

【 摘 要 】

Cholera bacteria exhibit strong association with coastal plankton. Characterization of space-time variability of chlorophyll, a surrogate for plankton abundance, in the northern Bay of Bengal is an essential first step to develop any methodology for predicting cholera outbreaks in the Bengal Delta region using remote sensing. This study quantifies the space-time distribution of chlorophyll, using the data from SeaWiFS, in the Bay of Bengal region using 10 years of satellite data. Variability of chlorophyll at daily scale, irrespective of spatial averaging, resembles white noise. At a monthly scale, chlorophyll shows distinct seasonality and chlorophyll values are significantly higher close to the coast than in the offshore regions. At pixel level (9 km) on monthly scale, on the other hand, chlorophyll does not exhibit much persistence in time. With increased spatial averaging, temporal persistence of chlorophyll increases and lag 1 autocorrelation stabilizes around 0.60 for 1296 km(2) or larger areal averages. In contrast to the offshore regions, spatial analyses of chlorophyll suggest that only coastal region has a stable correlation length of 100 km. Presence (absence) of correlation length in the coastal (offshore) regions indicate that the two regions may have two separate processes controlling the production of phytoplankton. This study puts a lower limit on space-time averaging of satellite measured plankton at 1296 km(2) monthly scale to establish relationships with cholera incidence in Bengal Delta. (C) 2012 Elsevier Inc. All rights reserved.

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