NF-POGO alumni apprecia on Harmful algal bloom detec on and monitoring in the Gulf of Thailand and south central of Vietnam Khani ha UthaipanA and Ha Nam ThangB A
Department of Marine Science, Chulalongkorn University
Wikipage: h p://www.nf-pogo-alumni.org/~Khani ha+Uthaipan B
Faculty of Fisheries, Hue university of Agriculture and Forestry
Wikipage: h p://www.nf-pogo-alumni.org/~Thang+Ha
N
F-POGO AWI-CofE regional training programme on “Detec on of HABs in Southeast Asia by Remote Sensing Opera onal warning and regional monitoring protocols” was held at the Marine Science Ins tute, Philippines from February 24 to March 15, 2014. This training was to fulfil our concern for and increase our understanding about harmful algal blooms (HABs) in the region. To date, li le is known about the HABs in the Gulf of Thailand (GoT), although algal blooms phenomenon in this area is considered significant. During the training, a mini collabora ve project among Thai (khani ha Uthaipan) and Vietnamese par cipants (Tran Thi Mai Phuong, Nguyen Thi Thai Hoa, Hoang Phi Phung and Ha Nam Thang) on “Algal bloom detec on and monitoring in the GoT and the south central of Vietnam” was carried out. This study demonstrated an applica on of ocean color remote sensing and oceanographic data for anomaly analyzing chlorophyll-a concentra on (chl-a), spa al and temporal monitoring of algal blooms in the region. The study area was the upper GoT. The data were downloaded from Giovanni and Oceancolor website. The whole process comprised of 4 steps: (i) download of sea surface temperature (SST) and chl-a data from the website, (ii) transform SST and chl-a data to appropriate data sheets, (iii) analysis of SST and chl-a to indicate anomaly phenomena, and (iv) validate ocean color data with field data. The results indicated that high chl-a was found off river mouths in June - August, October, and December. From SST data, no spa al difference in temperature was found, and li le annual varia on of temperature was found in the range of 27 oC and 30 oC. No significant rela onship was found between SST and phytoplankton data taken from field surveys. Monthly chl-a from ocean color data in 2009 have shown a direct rela onship with monthly phytoplankton cell density, and this corresponded with red des phenomena reported in upper GoT. Time series analysis of chl-a anomaly during 2002-2012 indicated a cycle of roughly 3 year- me interval (Fig. 1). The change of chl-a seemed to be relate with monthly accumula on rainfall. High chl-a was found more frequent since 2006, which seemed to coincide with a nega ve Pacific Decadal Oscilla on (PDO) phase. The results urge an interes ng argument that chl-a in the upper GoT may have a closed rela onship with the changing climate. To understand the distribuon, mechanism, and nega ve influences of red des including HABs on regional fisheries, an establishment of research network in oceanography and HABs, as well as collabora ve projects among scien sts in the Southeast Asia region are of importance. In summary, we would like to express our faithful apprecia on to NF-POGO, AWI-CofE and MSI (Philippines) for celebra ng a wonderful workshop. You don’t hold your own knowledge but share it with us and we truly appreciate these contribu ons. Best regards to NANO community! Figure 1 - Chl-a anomaly (red bar), accumulated rainfall (green bar) and PDO index (blue line) during 2002-2012 in upper GoT.
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Contact us: Suriyan.S@chula.ac.th, info@nf-pogo-alumni.org, lilian.krug@nf-pogo-alumni.org NANO website: www.nf-pogo-alumni.org
