Low level jet study from the ISS Zhaoxia Pu Department of Atmospheric Sciences University of Utah ISS Winds Mission Science Workshop Miami, FL February.

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Presentation transcript:

Low level jet study from the ISS Zhaoxia Pu Department of Atmospheric Sciences University of Utah ISS Winds Mission Science Workshop Miami, FL February 10-11, 2011

Low Level Jet (LLJ) A region of relatively strong winds in the lower part of the atmosphere. Specifically, it often refers to a southerly wind maximum in the boundary layer, common over the Plains states at night during the warm season (spring and summer). The term also may be used to describe a narrow zone of strong winds above the boundary layer, but in this sense the more proper term would be low-level jet stream.

LLJ plays as the major conveyor of low-level moisture from the Gulf of Mexico into central US. Contribution of LLJ transport is almost 50% above average of non-LLJ values. It promotes nocturnal thunderstorm development LLJ is an important ingredient in the initiation of mesoscale convective complexes (MCCs) by advecting warm moist air into the genesis region of the MCCs. LLJ was found to be present for 75% of the squall lines that occurred in the Great Plains. Importance of LLJs (not a completed list)

Category of LLJ Max Wind Speed Below 1500m V max (m/s) Largest decrease from the max wind speed in the layer from the height of the max to 3000m ΔV (m/s) LLJ-0≥10≥5 LLJ-1≥12≥6 LLJ-2≥16≥8 LLJ-3≥20≥10 Categorical LLJ criteria from Whiteman (1997, LLJ-0) and Bonner (1968, LLJ-1 – LLJ-3)

Southerly Great Plains Jet Bonner (1968) LLJ Over US

Mean nocturnal LLJ (NLLJ) and 500 AGL wind at local midnight for (Rife et al. 2010)

Observations at Homestead site, OK during June 2002 GLOW (Goddard Lidar Observatory for Winds) Lidar Wind Observations International H 2 O Program (IHOP) field program: May and June 2002 Wind profile Resolution: 10 minutes; 100m below 3km and 200m above 3km of the height Over 240 h of data in 35 days x Bruce Gentry, NASA/GSFC

June 25, 2002 Time-height variation of the wind: Lidar vs. Sonde GLOW Sonde Li et al. (2011) LLJ Case During IHOP (2002)

Distribution of the maximum wind

LLJ-0

LLJ-1

LLJ-2

LLJ-3

GLOW Sonde NARR LLJ Case During IHOP (2002)

LLJ-0

LLJ-1

LLJ-2

LLJ-3

LLJs in the NCEP-NCAR reanalysis exhibit realistic spatial Distribution, but strong LLJs are infrequent……

20 The uncertainties of global wind analysis NCEP/NCAR Reanalysis vs. ERA-40, Mean wind speed and vector differences between two reanalyses at 850mb Mean wind speed and vector from NCEP reanalysis at 850mb Mean wind speed and vector differences between two reanalyses at 500mb Mean wind speed and vector from NCEP reanalysis at 500mb

ISS should bring an opportunity to improve analysis and forecasts of LLJs !