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Title: Severe weather conditions in the Arabian Sea and their impact on atmospheric N₂O budget
Authors: Patra, Prabir K
Maksyutov, Shamil
Nakazawa, Takakiyo
Keywords: Nitrous oxide;Arabian Sea;Transport modelling;Indian summer monsoon;Tropical cyclones
Issue Date: Mar-2004
Publisher: CSIR
IPC Code: Int. Cl. ⁷ G01W1/16, C09K3/30
Abstract: Influences of tropical cyclones and wide spread south-west monsoon on the ocean-atmosphere fluxes of nitrous oxide (N₂O) in the Arabian Sea are estimated. The NCEP/NCAR reanalysed wind speeds during a cyclone event are used to calculate N₂O fluxes from the Arabian Sea. It is found that net emission of N₂O from the Arabian Sea in a span of about 7 cyclonic days can contribute about 5.3% of its annual sources. This emission rate is about the same as that was observed (earlier estimates) during the south-west monsoon season in the Arabian Sea. The NIES/FRSGC global transport model is used to compute the tracer transport of monthly-mean high resolution fluxes to verify the significance of the Arabian Sea N₂O emission in comparison with 9 other source types of N₂O. The results show that the effect of N₂O flux from the Arabian Sea on its concentration at a coastal station is larger than some of the global scale anthropogenic sources. The transport model simulations suggest that some natural phenomena in the oceanic regions can even produce the fluctuations in the NvO time-series observed in the southern hemisphere.
Page(s): 84-94
ISSN: 0379-5136
Appears in Collections: IJMS Vol.33(1) [March 2004]

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