search

USGS-R / mda.lakes

Wisconsin Lake Modeling Aggregation
2 stars 11 forks source link

checking NARR source for similar wind bias #72

Open jordansread opened 9 years ago

jordansread commented 9 years ago

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

jordansread commented 9 years ago

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."

lawinslow commented 9 years ago

Hmm, pretty close timing to the jump we see.

jordansread commented 9 years ago

image

jordansread commented 9 years ago

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

lawinslow commented 9 years ago

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

jordansread commented 9 years ago

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

lawinslow commented 9 years ago

smoking gun...

jordansread commented 9 years ago

no mention here: http://www.emc.ncep.noaa.gov/mmb/rreanl/faq.html

jordansread commented 9 years ago

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

lawinslow commented 9 years ago

Only the cool kids use dropsondes

jordansread commented 9 years ago

image

jordansread commented 9 years ago

image

jordansread commented 9 years ago

there we go @lawinslow

lawinslow commented 9 years ago

Yup, mystery solved.

lawinslow commented 9 years ago

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

jordansread commented 9 years ago

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