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checking NARR source for similar wind bias #72

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jread-usgs opened this Issue Jul 10, 2015 · 16 comments

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jread-usgs commented Jul 10, 2015

related to #70

These files are broken up into yearly directories, and the temporal resolution is coarser than NLDAS-2 (3 hourly and ~32 km) http://www.esrl.noaa.gov/psd/thredds/catalog/Datasets/NARR/monolevel/catalog.html?dataset=Datasets/NARR/monolevel/vwnd.10m.1979.nc

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jread-usgs commented Jul 10, 2015

From Mitchell ea 2004: "To date, retrospective forcing is available from 1 October 1996 through 2002. Real-time forcing is available from 16 April 1999 to present."

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lawinslow commented Jul 10, 2015

Hmm, pretty close timing to the jump we see.

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jread-usgs commented Jul 10, 2015

image

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jread-usgs commented Jul 10, 2015

@lawinslow could that jump be pinned at the start of 2002, or the start of 2001?

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lawinslow commented Jul 10, 2015

Yeah, though I call it 2001, its really the start of 2002 (2001-12-31)

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jread-usgs commented Jul 10, 2015

ok, so that would exactly line up with a full switch to real-time forcing...

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lawinslow commented Jul 10, 2015

smoking gun...

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jread-usgs commented Jul 10, 2015

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jread-usgs commented Jul 10, 2015

In NARR, wind obs comes from:
Rawinsondes, dropsondes, pibals, aircraft, and geostationary satellite cloud drift movements

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lawinslow commented Jul 10, 2015

Only the cool kids use dropsondes

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jread-usgs commented Jul 10, 2015

image

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jread-usgs commented Jul 10, 2015

image

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jread-usgs commented Jul 10, 2015

there we go @lawinslow

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lawinslow commented Jul 10, 2015

Yup, mystery solved.

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lawinslow commented Jul 11, 2015

Also good to know it persists up to today. I had only looked through 2013.

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jread-usgs commented Jul 11, 2015

yeah, I skipped 2015 because it is/was incomplete as a season

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