Estimation of 1 km downwelling shortwave radiation over the Tibetan Plateau under all-sky conditions
-
Published:2023-08-24
Issue:16
Volume:23
Page:9265-9285
-
ISSN:1680-7324
-
Container-title:Atmospheric Chemistry and Physics
-
language:en
-
Short-container-title:Atmos. Chem. Phys.
Author:
Li Peizhen, Zhong LeiORCID, Ma Yaoming, Fu Yunfei, Cheng Meilin, Wang XianORCID, Qi Yuting, Wang Zixin
Abstract
Abstract. Downwelling shortwave radiation (DSR) is the basic
driving force for the energy and water cycles of the Earth's climate system.
Called the Third Pole of the Earth, the Tibetan Plateau (TP) absorbs a
large amount of shortwave radiation and exerts important impacts on global
weather and climate change. However, due to coarse spatial resolution and
insufficient consideration of factors influencing radiative transfer
processes, DSR parameterization schemes still need to be improved when
applied to the TP. Based on satellite datasets and meteorological forcing
data, all-sky DSR over the TP at a spatial resolution of 1 km was derived
using an improved parameterization scheme. The influence of topography and
different radiative attenuations were comprehensively taken into account.
Specifically, the introduction of cloud multiscattering and topography
factors further improves the DSR estimation accuracy. The validation results
indicated that the developed parameterization scheme showed reasonable
accuracy. By comparing with current, widely used DSR products based on the
same in situ observations, the derived DSR performed much better on
different spatial and temporal scales. On instantaneous, 10 d and
monthly timescales, the root-mean-square errors (RMSEs) of the derived DSR
are 132.8–158.2, 70.8–76.5 and 61.3–67.5 W m−2, respectively, which are
much smaller than those of current DSR products. The derived DSR not only
captured the temporal-variation characteristics that are more consistent
with the in situ measurements, but also provided reasonable spatial
patterns. Meanwhile, the proposed parameterization scheme demonstrated its
superiority in characterizing more details and high dynamics of the spatial
pattern of DSR due to its terrain correction and high resolution. Moreover,
this parameterization scheme does not need any local correction in advance
and has the potential to be extended to other regions in the world.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference110 articles.
1. Ahn, C., Torres, O., and Bhartia, P. K.: Comparison of ozone monitoring
instrument UV aerosol products with Aqua/Moderate Resolution Imaging
Spectroradiometer and multiangle imaging spectroradiometer observations in
2006, J. Geophys. Res., 113, D16S27, https://doi.org/10.1029/2007jd008832, 2008. 2. Bessho, K., Date, K., Hayashi, M., Ikeda, A., Imai, T., Inoue, H., Kumagai,
Y., Miyakawa, T., Murata, H., Ohno, T., Okuyama, A., Oyama, R., Sasaki, Y.,
Shimazu, Y., Shimoji, K., Sumida, Y., Suzuki, M., Taniguchi, H., Tsuchiyama,
H., Uesawa, D., Yokota, H., and Yoshida, R.: An introduction to
Himawari-8/9 – Japan's new-generation geostationary meteorological
satellites, J. Meteorol. Soc. Jpn., 94,
151–183, https://doi.org/10.2151/jmsj.2016-009, 2016. 3. Bisht, G. and Bras, R. L.: Estimation of net radiation from the MODIS data
under all sky conditions: Southern Great Plains case study, Remote Sens.
Environ., 114, 1522–1534, https://doi.org/10.1016/j.rse.2010.02.007, 2010. 4. Bisht, G., Venturini, V., Islam, S., and Jiang, L.: Estimation of the net
radiation using MODIS (Moderate Resolution Imaging Spectroradiometer) data
for clear sky days, Remote Sens. Environ., 97, 52–67,
https://doi.org/10.1016/j.rse.2005.03.014, 2005. 5. Chen, J., Hu, Z., Dou, S., and Zeyu, Q.: Yin–Yang Slope problem along
Qinghai–Tibetan Lines and its radiation mechanism, Cold Reg. Sci.
Technol., 44, 217–224, https://doi.org/10.1016/j.coldregions.2005.12.001, 2006.
|
|