CMIP6 數(shù)據(jù)基本介紹——入門教程(2)
我們平時(shí)下載到的 CMIP6 數(shù)據(jù),會(huì)發(fā)現(xiàn)這個(gè)文件名稱有一大串字符,如 CMIP6.GMMIP.BCC.BCC-CSM2-MR.amip-hist.r1i1p1f1.Amon.rlutcs.gn.nc。那么這個(gè)文件名有包含了哪些信息呢?對(duì)于 CMIP6 而言,依次表示如下信息:
<mip_era>/
??????<activity_id>/
??????????<institution_id>/
??????????????<source_id>/
??????????????????<experiment_id>/
??????????????????????<member_id>/
??????????????????????????<table_id>/
??????????????????????????????<variable_id>/
??????????????????????????????????<grid_label>/
??????????????????????????????????????<version>/
????????????????????????????????????????<CMOR filename>.nc
1.?<mip_era>?表示是屬于第幾次 CMIP 的計(jì)劃;
2.?<activity_id>?表示屬于哪個(gè)子計(jì)劃,比如上面的文件就是屬于 GMMIP 子計(jì)劃里面的數(shù)據(jù),即屬于全球季風(fēng)比較這個(gè)子計(jì)劃。
3.?<institution_id>?表示屬于哪個(gè)機(jī)構(gòu),比如上面的 BCC 則表明是屬于國家氣候中心;
4.?<source_id>?表示屬于哪個(gè)模式,比如上面的文件就表明這個(gè)數(shù)據(jù)來自于 BCC-CSM2-MR 這個(gè)模式的模擬;
5.?<experiment_id>?則表示是屬于哪些實(shí)驗(yàn),如下圖所示
6.?<member_id>?是運(yùn)行模式的一些控制指標(biāo)。
? ? member_id = r<k>i<l>p<m>f<n>,其中
? ? k = realization_index
? ? l = initialization_index
? ? m = physics_index
? ? n = forcing_index
7.?<table_id>?表示數(shù)據(jù)類型的處理方式,如月平均、日平均等等。下面給了所以 table_id 的簡介。
3hr : atmosphere sampled every 3 hours
6hrLev : 6-hourly data on atmospheric model levels
6hrPlev : 6-hourly atmospheric data on pressure levels (time mean)
6hrPlevPt : 6-hourly atmospheric data on pressure levels (instantaneous)
AERday : Daily atmospheric chemistry and aerosol data
AERfx : Fixed atmospheric chemistry and aerosol data
AERhr : Hourly atmospheric chemistry and aerosol data
AERmon : Monthly atmospheric chemistry and aerosol data
AERmonZ : Monthly atmospheric chemistry and aerosol data
Amon : Monthly atmospheric data
CF3hr : 3-hourly associated with cloud forcing
CFday : Daily data associated with cloud forcing
CFmon : Monthly data associated with cloud forcing
CFsubhr : Diagnostics for cloud forcing analysis at specific sites
E1hr : Hourly Atmospheric Data (extension)
E1hrClimMon : Diurnal Cycle
E3hr : 3-hourly (time mean, extension)
E3hrPt : 3-hourly (instantaneous, extension)
E6hrZ : 6-hourly Zonal Mean (extension)
Eday : Daily (time mean, extension)
EdayZ : Daily Zonal Mean (extension)
Efx : Fixed (extension)
Emon : Monthly (time mean, extension)
EmonZ : Monthly zonal means (time mean, extension)
Esubhr : Sub-hourly (extension)
Eyr : Daily (time mean, extension)
IfxAnt : Fixed fields on the Antarctic ice sheet
IfxGre : Fixed fields on the Greenland ice sheet
ImonAnt : Monthly fields on the Antarctic ice sheet
ImonGre : Monthly fields on the Greenland ice sheet
IyrAnt : Annual fields on the Antarctic ice sheet
IyrGre : Annual fields on the Greenland ice sheet
LImon : Monthly fields for the terrestrial cryosphere
Lmon : Monthly land surface and soil model fields
Oclim : Monthly climatologies of ocean data
Oday : Daily ocean data
Odec : Decadal ocean data
Ofx : Fixed ocean data
Omon : Monthly ocean data
Oyr : Annual ocean variables
SIday : Daily sea-ice data
SImon : Monthly sea-ice data
day : Daily Data (extension - contains both atmospheric and oceanographic data)
fx : Fixed variables
8.?<variable_id>?表示變量名的簡寫。下面給了部分變量名的列表。
9.?<grid_label>?表示輸出數(shù)據(jù)的網(wǎng)格的類型。

舉個(gè)例子:
下載完數(shù)據(jù)后,會(huì)發(fā)現(xiàn)文件名稱是復(fù)雜的一長串,如下所示:
tas_Amon_CIESM_ssp126_r1i1p1f1_gr_201501-210012.nc
其中:
1、 tas表示選擇的變量名稱;
2、 Amon即為table_id,表示數(shù)據(jù)類型的處理方式,如月平均、日平均等等;
3、 CIESM 對(duì)應(yīng)Source ID,表示屬于哪個(gè)模式。
4、 ssp126對(duì)應(yīng)Experiment ID,表示是屬于哪些實(shí)驗(yàn)
5、 數(shù)據(jù)合成方式
6、下載數(shù)據(jù)的格式(選gn就是NetCDF格式)
7、201501-210012表示數(shù)據(jù)覆蓋時(shí)間段