The AErosol RObotic NETwork(AERONET) provides the necessary ground-based observation to validate and assess the
applicability of the latest version MODIS Collection 005 aerosol optical thickness (AOT) products over the China sea for
the first time. Based on the two kinds of data, the method of validation was discussed over the China Sea. The validation
results show that the MODIS Collection 005 AOT has a good relationship with AERONET AOT and their correlation
coefficient is larger than 0.9 over the China Sea; With testing different validation methods, we find the window size of
MODIS data can influence the validation result, and the 30kmX30km window size is the best over the China sea. Finally,
the comparison of MODIS- and AERONET-derived AOT separately over different regions of the China Sea suggests
that MODIS Collection 005 AOT correspond with the error standard of NASA and most of its error can be controlled
under
±0.05 ±0.05τ over the China Sea, so MODIS Collection 005 AOT is creditable over the China Sea for science
research.
Multi-temporal series of satellite SPOT-VEGETATION Normalized Difference Vegetation Index (NDVI) has long
time-series from 1998 to present. The convenient downloading policy make those data can be widely used all through the
world. The data is used for global vegetation monitoring and variation analysis. The spring onset date reflects the
vegetation growth and its feedback to climate and human activity, and become an important variable for the global
climatic change and production monitoring. In this paper, the spatial spring onset date information in south and central
China is portrayed, and the spring onset frequency distribution map is sketched by using the multi-year 10-days
composite SPOT/VGT NDVI data. First, the long time series NDVI is reconstructed. Then a relative threshold value
method is given to determine whether the vegetation begins to resuscitate. The spring onset frequency map mainly
parallels the latitude. But because of the heterogeneity of vegetation and monsoon, the spring onset movements do not
parallel the latitude completely.
MODIS Collection005 aerosol product is validated by a new method over the China Sea. We use aerosol optical at
550nm(AOT550) and fine mode fraction(FMF) in its aerosol product to analyze the spatial distribution and season
variation of aerosol over the China Sea. Then meteorological data will be used to discuss the reason of aerosol
characteristics. The results show that firstly MODIS Collection005 aerosol product has a good quality over the China
Sea and it is better than MODIS Collection004 data over the China Sea. Secondly, AOT550 and FMF have a notable
season variation influenced by the meteorological condition and the transport from continental source. AOT550 reaches
the largest value in spring and winter, and it reaches the least value in summer and fall; oppositely, FMF reaches the
largest value in summer and fall, and it reaches the least value in spring and winter. In the third, AOT550 and FMF have
marked longitudinal variation. AOT550 appear the maximum value between 30°N-40°N and decrease towards to north
and south. Meanwhile, FMF increase from south to north and the tendency of the increase became slow at 30°N. And
they have an obvious meridional variation. AOT550 and FMF both decrease with the increase of longitude, which
suggest that anthropogenic aerosol have an important role over the China Sea. Finally, based on seven years
meteorological data, the reason of the aerosol characteristics over the China Sea are discussed. Wind and rainfall are the
two important factors.
Because of global climatic variations and anthropogenic influence on local environment, as the active interaction belt
between ocean and land, the coastal ecosystems are sensitive even part of them are under pressure. It is of very necessary
to diagnose whether they are in healthy stage. The Zhejiang coastal zone situated at about 120°E-123°E and 27°N-31°N, the landuse have changed largely during the past 20 years as long as the rapid economic development. In this
paper the largest island-Zhoushan island- in the Zhejiang coastal line is selected as the study site. The objective is to
establish a way to assess coastal ecosystem health stage. Indicators include the landuse transformation, water quality,
ecosystem services during 1986 to 2005. The results indicate that the human pressure become more and more large. The
scene generally is the outcome of economic pursuing activity. In the discussion we also provide some strategy to keep
the human and nature harmonious.
Shipboard hand-held sun photometers measurements which were collected over the East China Sea from December 15,
2006 to February 11, 2007, were used to discuss temporal and spacial distributions of aerosol optical thickness(AOT),
and the type and source of aerosol particles over the East China Sea. The results of this study suggest that AOT was
normally large in the coastal areas and became small gradually with the distance away from the coastal areas. The value
of AOT also was larger in the coastal areas with industry than those without industry. AOT was closely related to the
development of human activity and wind transportation. The analysis of many cases showed that the minimum AOT
value over sea appeared at noon during a day and its reason could be found in weather data. The calculated Ångstrom
wavelength exponent showed that the radius of aerosol particles was small in the coastal areas and large in the central
area of the East China Sea. It can provide the basic data for marine regional climate and remote sensing.
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