加载中…关于ERA5数据
(2022-06-23 15:22:34)
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再分析数据era5 |
分类： 数据网址 |
1.高分辨率不会提高数据精度，只是空间插值；降低分辨率可能会使数据走样
![]( "关于ERA5数据")
When you download CAMS data, C3S data and other data from
ECMWF, you can obtain the output data on its archived grid or on a
Cartesian lat/long grid at a custom resolution.
You can specify a higher output resolution than the archived
resolution, but the resulting data will not contain any more
information than the original, it has merely been interpolated[1]
to a higher resolution. This makes the output look smoother, but
does not increase the accuracy or the precision of the data.
However, if you choose to interpolate to a coarser resolution than
the archived resolution you should be aware that the data can be
aliased, unless care was taken to avoid this.
2.The lat/long equivalent of T639 is 0.28125 deg
= (360/(2*(639+1)))
3.https://confluence.ecmwf.int/display/CKB/ERA5:+What+is+the+spatial+reference
4。计算daily precipitation
p(mm)=p(m)*1000 ；Total precipitation over the one hour ending
at forecast step
；The total precipitation over 24 hours is the sum of the
individual total precipitation values for each hour.
https://confluence.ecmwf.int/pages/viewpage.action?pageId=197702790
5.At ECMWF, the variables TCWV (Total Column Water Vapour) and
VIWV (Vertical Integral of Water Vapour) are essentially the same,
but are produced by different software.
TCWV is generally produced by the ECMWF NWP forecast system
(using the IFS) and is available in the analyses and
forecasts.
VIWV is produced by the ERA post processing budget software
and, for ERA-Interim, is only available in the analyses.
The units of both TCWV and VIWV are kgm-2.
6.ERA5_hourly求月平均=ERA5_monthly
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