Variation in downwelling diffuse attenuation coefficient in the northern South China Sea

Guifen Wang; Wenxi Cao; Dingtian Yang; Dazhi Xu

doi:10.1007/s00343-008-0323-x

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Variation in downwelling diffuse attenuation coefficient in the northern South China Sea

Updated：2023-05-16

- Variation in downwelling diffuse attenuation coefficient in the northern South China Sea
- Journal of Oceanology and Limnology Vol. 26, Issue 3, Pages: 323-333(2008)
- Affiliations：
  
  1. LED Laboratory South China Sea Institute of Oceanology Chinese Academy of Sciences
  2. The Graduate School of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-008-0323-x
  CLC：
- Online First：20 August 2008，
  
  Published：2008
- Accepted：
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Wang, G., Cao, W., Yang, D. et al. Variation in downwelling diffuse attenuation coefficient in the northern South China Sea., Chin. J. Ocean. Limnol. 26, 323–333 (2008). https://doi.org/10.1007/s00343-008-0323-x
DOI：

Wang, G., Cao, W., Yang, D. et al. Variation in downwelling diffuse attenuation coefficient in the northern South China Sea., Chin. J. Ocean. Limnol. 26, 323–333 (2008). https://doi.org/10.1007/s00343-008-0323-x DOI：

摘要

Abstract

The diffuse attenuation coefficient for downwelling irradiance (K d(λ)) is an important parameter for ocean studies. Based on the optical profile data measured during three cruises in the northern South China Sea in autumn from 2003 to 2005

variations in the K d(λ) spectra were analyzed. The variability of K d(λ) shows much distinct features in both magnitude and spectra pattern

it is much higher in coastal waters than that of open oceanic waters; and the blue-to-green (443/555) ratio of K d(λ) tends to increase with chlorophyll a concentration ([Chl-a]) from open ocean to coastal waters. These characteristics can be explained most by the increase of a w+p(443)/a w+p(555) with [Chl-a]. In short waveband

the relation between K d(λ)-K w(λ) and [Chl-a] can be well described by a power law function

indicating the large contribution of phytoplankton to the variations in K d(λ). As for the spectral model of the diffuse attenuation coefficient

there are good linear relationships between K d(490) and K d(λ) in other wavelengths with own slope and intercept of a linear functions in the spectral range 412–555 nm. K d(490) is well correlated with the spectral ratio of remote sensing reflectance; and should enough measurement data are given

this empirical algorithm would be used in the K d(λ) retrieval from ocean color satellite data. The variation in K d(λ) provides much useful information for us to study the bio-optical property in the northern South China Sea.

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references

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