[ncl-talk] averaging over non-consecutive, user-inputted times
Dennis Shea
shea at ucar.edu
Thu Jun 4 21:16:26 MDT 2015
Untested ... I suggest you become familiar with 'cd_calendar'
As Walter indicated creating an array is done via (/ ... /)
YYYYMM = cd_calendar(u&time, -1) ; information only
print(YYYYMM)
; Calculate the seasonal averages.
uDJF = month_to_season(u, "DJF")
printVarSummary(uDJF)
ymdhms = cd_calendar(uDJF&time, 0)
printVarSummary(ymdhms)
yrDJF = toint(ymdhms(:,0))
; https://www.ncl.ucar.edu/Document/Functions/Contributed/get1Dindex.shtml
yearList_lo = (/1963,1964,1965,1969,1977,1979,1996,1997,2010,2011/)
iyrDJF = get1Dindex(yrDJF,yearList_lo)
print("")
print(iyrDJF+" "+yearList_lo)
print("")
loDJF = dim_avg_n_Wrap(uDJF(iyrDJF,:,:), 0)
printVarSummary(loDJF)
On Thu, Jun 4, 2015 at 8:26 PM, Walter Kolczynski <
walter.kolczynski at noaa.gov> wrote:
> Mira,
>
> If you want to pass in a literal array to subset, you need to use (/ ...
> /), not just parenthesis.
>
> uDJF_NAO_lo = uDJF((/10,11,12,16,24,26,43,44,57,58/),:,:)
>
> - Walter
>
> On 04-Jun-15 22:05, mberdahl at envsci.rutgers.edu wrote:
> > Hi all,
> >
> > I have downloaded NCEP reanalysis winds (u and v), each with dimensions
> > [time x lat x long]. The data runs from 1948 - current. I take the DJF
> > seasonal average first. Next, I am trying to take an average of
> > user-inputted, non-consecutive years. So for example, I'd like to take
> > the average over, say, 1958, 1967, 1999 and 2001. I have used
> > dim_avg_n_wrap to do averages before, but as far as I can see I can only
> > choose a range of consecutive years with this. Is there a simple way to
> > do this? Also, I manually convert the years to indices, but not sure
> > that's the way to go.
> >
> > My code and some of the VarSummaries are copied here. I run into an
> error
> > when trying to make a list of years at line 43
> > (uDJF_NAO_lo = uDJF((10,11,12,16,24,26,43,44,57,58),:,:))
> >
> > Thanks!
> > Mira
> >
> >
> >
> > ;****************************************************
> > load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> > load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> > load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> > load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
> > ;************************************************
> > begin
> > ;************************************************
> > ; read in netCDF file
> > ;************************************************
> > a = addfile("uwnd.mon.mean.nc","r")
> > print(a)
> > b = addfile("vwnd.mon.mean.nc","r")
> >
> > ;************************************************
> > ; read in zonal [u] and meridional [v] winds (July)
> > ;************************************************
> >
> > u = a->uwnd(0:803,{45:90},{270:357.5})
> > v = b->vwnd(0:803,{45:90},{270:357.5}) ; Get u, v, time (1),level
> > (1000hpa),latitude(-90:90) and longitude(0:360) data.
> >
> > printVarSummary(u)
> > printVarSummary(v)
> >
> > ; Calculate the seasonal averages.
> > uDJF = month_to_season(u, "DJF")
> > vDJF = month_to_season(v, "DJF")
> >
> > printVarSummary(uDJF)
> > printVarSummary(vDJF)
> >
> > ; I want to average over these years.
> > ; yearList_lo = 1963 1964 1965 1969 1977
> > 1979 1996 1997 2010 2011
> > ; this data starts at 1948 (this is index 0), so 1953=5, 1963=10 etc.
> >
> > uDJF_NAO_lo = uDJF((10,11,12,16,24,26,43,44,57,58),:,:)
> >
> >
> > ;************************************************
> > ; create plot
> > ;************************************************
> > wks = gsn_open_wks("ps","vector_") ; open a ps file
> >
> > vcres = True ; plot mods desired
> > vcres at gsnAddCyclic = False;
> > vcres at gsnFrame = False ; so we can draw time stamp
> > vcres at vcRefAnnoOrthogonalPosF = -1.0 ; move ref vector up
> > vcres at vcRefMagnitudeF = 10.0 ; define vector ref mag
> > vcres at vcRefLengthF = 0.045 ; define length of vec ref
> > vcres at vcGlyphStyle = "CurlyVector" ; turn on curly vectors
> > vcres at vcMinDistanceF = 0.017
> >
> > ;************************************************
> > ; Choose a subregion
> > ;************************************************
> > vcres at mpFillOn = False ; turn off gray fill
> > vcres at mpOutlineBoundarySets = "National" ; turn on country boundaries
> > vcres at mpGeophysicalLineColor = "Navy" ; color of cont. outlines
> > vcres at mpGeophysicalLineThicknessF = 1.5 ; thickness of outlines
> >
> > vcres at mpMaxLatF = 90 ;maximum latitude
> > vcres at mpMinLatF = 45 ;minimum latitude
> > vcres at mpMaxLonF = 357.5 ;maximum longitude
> > vcres at mpMinLonF = 270 ;minimum longitude
> >
> > vector = gsn_csm_vector_map_ce(wks,uAvgTime,vAvgTime,vcres)
> >
> > frame (wks)
> > end
> >
> >
> >
> >
> >
> > *************************************************************
> >
> > Converted to chunked, deflated non-packed NetCDF4 2014/09
> > title : monthly mean uwnd.sig995 from the NCEP Reanalysis
> > dimensions:
> > lat = 73
> > lon = 144
> > time = 808 // unlimited
> > variables:
> > float lat ( lat )
> > units : degrees_north
> > actual_range : ( 90, -90 )
> > long_name : Latitude
> > standard_name : latitude
> > axis : Y
> >
> > float lon ( lon )
> > units : degrees_east
> > long_name : Longitude
> > actual_range : ( 0, 357.5 )
> > standard_name : longitude
> > axis : X
> >
> > double time ( time )
> > long_name : Time
> > delta_t : 0000-01-00 00:00:00
> > prev_avg_period : 0000-00-01 00:00:00
> > standard_name : time
> > axis : T
> > units : hours since 1800-01-01 00:00:0.0
> > actual_range : ( 1297320, 1886808 )
> >
> > float uwnd ( time, lat, lon )
> > long_name : Monthly Mean Zonal Wind at sigma level 0.995
> > valid_range : ( -102.2, 102.2 )
> > units : m/s
> > add_offset : 0
> > scale_factor : 1
> > missing_value : -9.96921e+36
> > precision : 2
> > least_significant_digit : 1
> > var_desc : u-wind
> > dataset : CDC Derived NCEP Reanalysis Products
> > level_desc : Surface
> > statistic : Mean
> > parent_stat : Other
> > actual_range : ( -18.83935, 18.80581 )
> > _FillValue : -9.96921e+36
> >
> >
> > Variable: u
> > Type: float
> > Total Size: 2199744 bytes
> > 549936 values
> > Number of Dimensions: 3
> > Dimensions and sizes: [time | 804] x [lat | 19] x [lon | 36]
> > Coordinates:
> > time: [1297320..1883904]
> > lat: [45..90]
> > lon: [270..357.5]
> > Number Of Attributes: 15
> > long_name : Monthly Mean Zonal Wind at sigma level 0.995
> > valid_range : ( -102.2, 102.2 )
> > units : m/s
> > add_offset : 0
> > scale_factor : 1
> > missing_value : -9.96921e+36
> > precision : 2
> > least_significant_digit : 1
> > var_desc : u-wind
> > dataset : CDC Derived NCEP Reanalysis Products
> > level_desc : Surface
> > statistic : Mean
> > parent_stat : Other
> > actual_range : ( -18.83935, 18.80581 )
> > _FillValue : -9.96921e+36
> >
> > Variable: v
> > Type: float
> > Total Size: 2199744 bytes
> > 549936 values
> > Number of Dimensions: 3
> > Dimensions and sizes: [time | 804] x [lat | 19] x [lon | 36]
> > Coordinates:
> > time: [1297320..1883904]
> > lat: [45..90]
> > lon: [270..357.5]
> > Number Of Attributes: 15
> > long_name : Monthly Mean Meridional Wind at sigma level 0.995
> > valid_range : ( -102.2, 102.2 )
> > units : m/s
> > add_offset : 0
> > scale_factor : 1
> > missing_value : -9.96921e+36
> > precision : 2
> > least_significant_digit : 1
> > var_desc : v-wind
> > dataset : CDC Derived NCEP Reanalysis Products
> > level_desc : Surface
> > statistic : Mean
> > parent_stat : Other
> > actual_range : ( -15.43516, 19.79167 )
> > _FillValue : -9.96921e+36
> >
> > Variable: uDJF
> > Type: float
> > Total Size: 183312 bytes
> > 45828 values
> > Number of Dimensions: 3
> > Dimensions and sizes: [time | 67] x [lat | 19] x [lon | 36]
> > Coordinates:
> > time: [1297320..1875888]
> > lat: [45..90]
> > lon: [270..357.5]
> > Number Of Attributes: 16
> > long_name : DJF: Monthly Mean Zonal Wind at sigma level 0.995
> > valid_range : ( -102.2, 102.2 )
> > units : m/s
> > add_offset : 0
> > scale_factor : 1
> > missing_value : -9.96921e+36
> > precision : 2
> > least_significant_digit : 1
> > var_desc : u-wind
> > dataset : CDC Derived NCEP Reanalysis Products
> > level_desc : Surface
> > statistic : Mean
> > parent_stat : Other
> > actual_range : ( -18.83935, 18.80581 )
> > _FillValue : -9.96921e+36
> > NMO : 0
> >
> > Variable: vDJF
> > Type: float
> > Total Size: 183312 bytes
> > 45828 values
> > Number of Dimensions: 3
> > Dimensions and sizes: [time | 67] x [lat | 19] x [lon | 36]
> > Coordinates:
> > time: [1297320..1875888]
> > lat: [45..90]
> > lon: [270..357.5]
> > Number Of Attributes: 16
> > long_name : DJF: Monthly Mean Meridional Wind at sigma level 0.995
> > valid_range : ( -102.2, 102.2 )
> > units : m/s
> > add_offset : 0
> > scale_factor : 1
> > missing_value : -9.96921e+36
> > precision : 2
> > least_significant_digit : 1
> > var_desc : v-wind
> > dataset : CDC Derived NCEP Reanalysis Products
> > level_desc : Surface
> > statistic : Mean
> > parent_stat : Other
> > actual_range : ( -15.43516, 19.79167 )
> > _FillValue : -9.96921e+36
> >
> >
> > _______________________________________________
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> > ncl-talk at ucar.edu
> > List instructions, subscriber options, unsubscribe:
> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
> --
> Walter Kolczynski, Jr.
> Global Ensemble Team
> NOAA/NWS/NCEP/EMC (via I.M. Systems Group)
> (301) 683-3781
>
> _______________________________________________
> ncl-talk mailing list
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> List instructions, subscriber options, unsubscribe:
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>
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