DJF JJA - SSEC, UW-Madisoncimss.ssec.wisc.edu/iwwg/iww11/talks/Session6_Garay.pdfDJF (Ocean Only)...

NCEP-2/MISR Zonal Mean Winds 2001-2007

1

DJF JJA


2


3

Note: This is a comparison of climatologies, so observa7ons are not spa7ally/temporally

matched.


4

Both loca7on and magnitude of

westerlies & easterlies in good agreement


5

Differences in loca7on and magnitude of near-‐surface

westerlies in southern hemisphere (not well-‐constrained in reanalysis)

6 -21 +14 +21 -14 -7 +7 0

MISR Tropical Meridional Winds 2001-2007 DJF

(Ocean Only)

MISR Tropical Meridional Winds 2001-2007

7 -21 +14 +21 -14 -7 +7 0

Hadley Circula7on is clearly evident in this

season

DJF (Ocean Only)

8

Frequency of Wind Speeds > 20 m/s Over Land

Low High

Height ≤ 5 km AGL

9

Frequency of Wind Speeds > 20 m/s Over Land

Low High

Height ≤ 5 km AGL

2 2

3

2

3

2 2

4

2 2 2

3 5 5 4

2 19 15

8

5 8 4 2

13 15

7 3

9 8 6

2 2

10°N

20°N

30°N

15°N

25°N

35°N

10°W 0°E 10°E 20°E 30°E 5°W 5°E 15°E 25°E 35°E

Bodélé Depression

Ténéré Desert Western

Sahara Desert

Algeria

Mauritania

Mali

Niger Chad

Libya

Sudan

Nigeria

Qattara Depression

Selima Sand Sheet

Egypt

Mediterranean Sea

Sahara Desert

Frequency of Wind Speeds Greater than 20 m/s over Africa (DJF)

10

11

Hand Digitized Case using MINX Software

12

Hand Digitized Case using MINX Software

Wind corrected heights ~ 700m Surface al7tude

Zero wind heights apparently below surface

Wind speed ~18 m/s

Analysis of 476 MISR dust plumes from the Bodélé Depression in Chad. Wind

speeds decrease and histogram becomes broader with distance from the dust source where low level jet is funneled

between two mountain ranges

Winds diverge away from Bodélé Depression

(funneling between mountains)

High-Resolution Cross-Track Winds

15

Hurricane Ida 11/08/2009


16



17



18



19



20



21



22



23


10 m/s

40 km


15 km Altitude

12 km Altitude

24


Size of feature and large divergence at cloud top suggest the presence of a vortical hot

tower in the eyewall of the hurricane

Hurricane Ida – 2009 in situ Comparison

25 25

Aircraft Track


26 26

Aircraft Track


27 27

Altitude

Wind Speed

MISR

Aircraft

MISR

Aircraft


28 28

Altitude

Wind Speed

MISR

Aircraft

MISR

Aircraft

Disagreement where heights disagree

Agreement within ≤ 4 m/s

Stratocumulus Cloud-Top Divergence

29

MISR Orbit 47143, Path 11, Blocks 100-101 28 October 2008


30 -20

-16

-12

-8

-4

0

+4

+8

+12

+16

+20

Linear Convergence 1x10-5 s-1

CON

DIV


31 -20

-16

-12

-8

-4

0

+4

+8

+12

+16

+20

Linear Convergence 1x10-5 s-1

CON

DIV

Divergence

Convergence

32 32

Summary n  MISR Details

n  Data from February 2000 to present

n  Polar orbit, 10:30 a.m. equator crossing (descending)

n  400 km swath width

n  9 cameras at fixed viewing angles (±70.4°, ±60°, ±45.6°, ±26.1°, 0°)

n  275 m resolution red band (all bands nadir)

n  1.1 km resolution other bands off nadir

n  Current Cloud Products

n  Cloud-top heights 1.1 km horizontal, 500 m vertical

n  Cloud motion vectors 70.4 km horizontal, 500 m vertical

n  New Cloud Products (Currently Testing)

n  Cloud-top heights 1.1 km horizontal, < 500 m vertical

n  Cross-track cloud motion 1.1 km horizontal, < 500 m vertical

n  Cloud motion vectors 17.6 km horizontal, < 550 m vertical

Contact: [email protected]

DJF JJA - SSEC, UW-Madisoncimss.ssec.wisc.edu/iwwg/iww11/talks/Session6_Garay.pdfDJF (Ocean Only)...

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