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Observing System Simulation Experiments at CIMSS. By CIMSS/OSSE Team : Bob Aune ; Paul Menzel ; Jonathan Thom Gail Bayler ; Chris Velden ; Tim Olander and Allen Huang Cooperative Institute for Meteorological Satellite Studies University of Wisconsin 7 June, 1999. Road Map.

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Observing System Simulation Experiments at CIMSS


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slide1

Observing System Simulation Experiments at CIMSS

By

CIMSS/OSSE Team :

Bob Aune ; Paul Menzel ; Jonathan Thom

Gail Bayler ; Chris Velden ; Tim Olander

and Allen Huang

Cooperative Institute for Meteorological Satellite Studies

University of Wisconsin

7 June, 1999

road map
Road Map

1) Geostationary Interferometer Initial Focus

Soundings (S) = T, Td

Winds (W)

Soundings plus Winds

Soundings, Winds plus Conventional Data (CD)

2) First: Simulated Products; Followed by Derived Products from Simulated Radiances

3) Investigation of LIDAR Winds on top of S, W, and CD

slide19

4. Assess The Impact

The impact of the observations will be assessed by objectively measuring the ability of each observing system to steer the resulting 12-hour forecasts toward the “true” atmosphere.

Observation count

T/Td* WIND#Experiment

None None No Observations (NO) = NO OBS

~5000 ~6000 Geo. Radiometer (GR) = GEO-R

~5000 ~6000 Geo. Interferometer (GI) = GEO-I

~6200 ~12000 Perfect Observations (PO) = OPTIMAL

* : profile # : vector

wind objectives
Wind Objectives

1) To assess the value of wind observations to operational mesoscale numerical weather forecasts in a controlled environment

2) To assess the incremental value of current and future geostationary infrared/visible, and LIDAR wind measurements

wind profile osse
Wind Profile OSSE

Simulated Error for Clear Water Vapor Winds (m/s)

Pressure (mb) GEO-R GEO-I*

200 N/A 4

300 6 4

400 5.5 3.5

500 5 3

700 N/A 2.5

* Projected 30-40 % improvement over Geo-R

wind profile osse1
Wind Profile OSSE

Simulated Error for Cloudy Water Vapor & IR Winds (m/s)

Pressure (mb) GEO-R GEO-I*

200 5.5 3.6

300 5 3.3

400 4.5 2.9

500 4.5 2.9

700 4.0 2.6

850 3.5 2.3

* Projected 30-40 % improvement over Geo-R

Cloud altitude defines wind level

winds osse results continued
Winds OSSE Results - Continued

Winds OSSE results are preliminary

current status
Current Status

1) OSSE is designed, implemented, and pilot experiment conducted.

2) Winds counterpart, sounding profiles, are successfully assimilated and forecast impact assessed for a case study.

3) Winds assimilation is performed and is under detailed analysis now.

4) CIMSS OSSE home page:

http://cimss.ssec.wisc.edu/model/osse/osse05.html

plans for the on going work
Plans for the On-going Work

1) Simulate winds using radiances

2) 14 day test periods (winter and spring)

3) Conventional observing system evaluation

4) Low Earth Orbit (LEO) OSSE

5) Temperature/water vapor sounding and winds combined OSSE

6) LIDAR wind OSSE

hurricane bonnie wind and cloud fields
Hurricane Bonnie Wind and Cloud Fields

Wind Vectors :

Red - 1 km level

Green - 14 km

level

Clouds :

Light gray -

Ice Cloud

Dark Gray -

Water Cloud

hurricane bonnie wind and cloud fields1
Hurricane Bonnie Wind and Cloud Fields

Wind Vectors :

Magenta

Stream Lines :

Green (@ 4 km)

Clouds :

Light gray -

Ice Cloud

Dark Gray -

Water Cloud