SEARCH CARRIE ARMBRECHT
GRADUATE STUDENTS
 
Interannual Variation of Biological Productivity in the Arabian Sea
Carrie Armbrecht, Artur Palacz, Andrew Millar, Huijie Xue, and Fei Chai
Poster Presentation at the Ocean Sciences Meeting, Portland, OR
February 22, 2010 through February 26, 2010
What is the Relationship Among Multiple Remote Sensing Products in the Arabian Sea?
Concept map
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About Concept Mapping:
Concept maps are graphical tools that highlight fundamental concepts and the types of connections between concepts within complex systems. Educators can use concept maps to assess how students develop understanding. For example, students and educators can modify maps to reflect changes in the scope and depth of their understanding. The concept map on this page was created using the COSEE-OS Concept Map Builder.

About this Student:
Carrie Armbrecht is a graduate student in the School of Marine Sciences at the University of Maine. She is working towards dual masters in Oceanography and Marine Policy (with a focus in education and outreach). She has a B.A. in Psychology from Wellesley College. Her integrated thesis work with Dr. Fei Chai and Annette deCharon examines climate change in the Arabian Sea region. She is looking at atmospheric and oceanic processes; social responses; and communication and education techniques related to climate change. [more]
Carrie Armbrecht
 
Previous research shows seasonal monsoons in the Arabian Sea are strengthening due to global warming and less snow cover in the Himalayas. These stronger monsoons lead to increased upwelling and more phytoplankton (Figure 1 and Figure 2). As global warming continues, so will this trend, resulting in a more productive upwelling ecosystem (Figure 3) (Goés, et al., 2005). This study further examines this trend. We analyze longer time series of multiple remote sensing products for the upwelling region in the Arabian Sea.

Methods
Linear regression was performed on area-averaged (5-10°N; 47-55°E) chlorophyll a and sea surface temperature (SST) satellite derived data from 1997 to 2009. It focused on the summer monsoon months (June, July, and August) which are the upwelling period of the Arabian Sea. Results showed chlorophyll a increasing until 2003, and then decreasing afterwards (Figure 4). This confirms the previous study (Figure 3), but also reveals the decreasing trend after 2003. SST showed a decreasing trend up to 2003 and then an increasing trend after.

Conclusions
Using two different statistical methods, we find chlorophyll a increasing from 1997-2003 due to strengthening summer monsoon winds, which agrees with the previous study. After 2004, the increase did not continue but instead decreased because of the summer monsoon winds changing.

With a simple regression we examined a smaller data set (i.e. only summer months). With HHT we identified multiple temporal signals with the seasonal cycle being the dominate one. We also detected long-term trends that agree with the simple regression analysis.

Chlorophyll a increased until 2004 and then decreased (top of Figure 5). 1997-2009 SST showed a decreasing trend until 2004 then a plateau (top of Figure 6). HHT also depicts the seasonal cycle which is the dominate signal in the Arabian Sea (bottom of Figure 5 and Figure 6).
 
Poster image
Using Concept Maps Alongside Remote Sensing Analysis

Concept mapping is used in this study to a) tell the overarching, complex climate change story in the Arabian Sea, and to b) show where remote sensing analysis ties to specific, related concepts. The map was created with the COSEE-OS CLIMB software. As the dynamic map grows, supporting materials can be attached to individual concepts to enrich the story.
References
Goés, Joaquim I., Prasad G. Thoppil, Helga do Rosario Gomes, and John T. Fasullo, 2005. Warming of the Eurasian Landmass is Making the Arabian Sea More Productive, Science 308 (5721), pp. 545-547.
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