Studi Tentang Proses pertukaran CO2 dan Interaksinya antara Atmosfer dan Lautan Menggunakan Citra ALOS/PALSAR

STUDY OF AIR-SEA INTERACTION AND CO2 EXCHANGE PROCESS BETWEEN THE ATMOSPHERE AND OCEAN USING ALOS/PALSAR
(Study Cases of Wind Wave Bubbling Process in Badung and Lombok Straits)

Ni Wayan Ekayanti, Takahiro Osawa, I Wayan Kasa, and A. Rahman As-syakur

ABSTRAK

CO2 ExchangePeningkatan CO2 di atmosfer yang berpotensi menghasilkan pemanasan global telah menjadi perhatian bagi kehidupan manusia. Lautan mengandung lima puluh kali lebih besar CO2 daripada atmosfer dan menjadi penyangga yang membatasi konsentrasi CO2 dalam atmosfer. CO2 mengalami perubahan secara terus menerus antara udara-lautan dan konsentrasi CO2 di dalam laut dikendalikan oleh parameter fisika, kimia, dan biologi. Perubahan konsentrasi CO2 antara udara-lautan dapat ditentukan dari interaksi gas dan perbedaan konsentrasi CO2 antara udara-lautan. Perubahan CO2 antara udara-lautan dapat dikaji dari studi kecepatan angin, koefisien gesekan kecepatan angin yang diperoleh dari satelit ALOS/PALSAR di daerah Selat Badung dan Selat Lombok, salinitas, dan juga dengan SST yang diperoleh dari satelit MODIS. Hasil analisis menunjukkan bahwa koefisien perubahan CO2, perbedaan tekanan CO2 antara udara-lautan, dan CO2 flux antara udara-lautan secara berturut-turut adalah 0.303±0.006 (rata-rata ± standar deviasi) (mol m-2 month-1µatm-1), 17.94±10.79 μatm, and 5.35±3.26 (mol m-2 month-1), dengan nilai maksimum dan minimum dari koefisien perubahan CO2 secara berturut-turut terjadi pada bulan Agustus dan Februari.

Kata kunci: CO2 flux, koefisien pertukaran CO2, perbedaan tekanan CO2, suhu permukaan laut (SST).

ABSTRACT

The increase of atmospheric CO2 and the potentially resulting global warming has been a great concern for human society. Ocean contains more than fifty times carbon in the atmosphere and can be taken as a buffer limiting the concentration of CO2 in atmosphere. CO2 flux between atmosphere and ocean or CO2 concentration in ocean is controlled by physical, chemical, and biological process. It can be determined from air-sea CO2 concentration differences and CO2 exchange process between the atmosphere and ocean. To obtain air-sea interaction and CO2 exchange process between the atmosphere and ocean using ALOS/PALSAR of Badung and Lombok Straits, monthly sea surface temperature (SST), wind friction velocity (u*) data, and the local oceanography data of the ocean were collected and analyzed. CO2 exchange coefficient, different partial pressures CO2 (∆pCO2), and Carbon dioxide (CO2) flux at air-water interface in the strait were calculated using alkalinity, active coefficient, and sea surface temperature (SST). The CO2 exchange coefficient, CO2 fluxes, and ∆pCO2 at different month and areas were estimated by concentration gradient between water and air in consideration of Schmidt numbers and wind friction velocity (u*). The results indicated that the mean values of CO2 exchange coefficient, ∆pCO2, and CO2 fluxes in Badung and Lombok straits areas, were 0.303±0.006 (mean ± standard deviation) (mol m-2 month-1µatm-1), 17.94±10.79 μatm, and 5.35±3.26 (mol m-2 month-1), respectively. Maximum and minimum CO2 exchange coefficient distributions were found in August and February, respectively. Maximum and minimum ∆pCO2 and CO2 fluxes values were found on February and August, respectively, during the higher and lower SST.

Keywords: CO2 flux, CO2 exchange coefficient, ∆pCO2, SST.

Selengkapnya bisa di baca pada:
Ekayanti, N.W., T. Osawa, I W. Kasa, and A.R. As-syakur. 2009. Study of Air-Sea Interaction and CO2 Exchange Process Between The Atmosphere and Ocean Using ALOS/Palsar (Study Cases of Wind Wave Bubbling Process in Badung and Lombok Straits). Jurnal Bumi Lestari, Vol 9, No 2. p 151-158

Satu Tanggapan to “Studi Tentang Proses pertukaran CO2 dan Interaksinya antara Atmosfer dan Lautan Menggunakan Citra ALOS/PALSAR”

  1. eka Says:

    malu ah balas…..


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