A HIAPER Campaign to Observe the Impact of Dust on the Pacific OceanAnd North America

V. Ramanathan, D. Rogers and J. StithNational Center for Atmospheric Research

Major Questions:

How Dusty and Polluted is the Pacific Ocean?

How much Dust and Pollution Enters N. America from mid and upper troposphere?

How Does the Dust and BC Impact the Pacific Cloud Systems in the Mid and upper Troposphere?

What is the impact of the dust and the dusty cloud systems on solarRadiation (Dimming) over the Pacific Ocean?

By interacting with solar and long wave radiation, Does the Dust/Pollution Impact Pacific SSTs and Storm Tracks?

Asian Dust Distributions from Horizontal to VerticalF. Li and V. Ramanathan

Center for Atmospheric Sciences,Scripps Institution of Oceanography,University of California, San Diego

To be Submitted to J. Climate, May 2005

Pacific Ocean

Arabian Sea

SAGE II aerosol profiles, seasonal mean, 1984-2001Yellow Sea (30N-50N, 120E-150E)

0

5

10

15

20

25

30

35

40

45

1.E-07 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00

extinction coefficient (1/km, 1020nm)

Hei

ght (

km)

Mar_Apr_May

Jun_Jul_AugSep_Oct_Nov

Dec_Jan_Feb

Dust-Ice Cloud Interactions

Flight 4 (03 April 2004): Aerosol layer at ca. 3500 m

Vertical Profiles for Dust Event #1

Continental pollution

morning afternoon Continental/urban pollution

CIFEX Campaign; Trinidad Head, CA

MIDWAY Obs. Prospero;Now an ABC Observatory

CIFEX Campaign; Trinidad Head, CA

MODIS AOD and Effective Radius (EFR), over Asian Dust Area, Yellow Sea (30N-50N, 120E-150E), 2000-2003

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Month

AO

D (

550n

m)

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

1.4AOD

EFR

2000 2001 2002 2003

Effe

ctiv

e R

adiu

s (u

m)

MODIS AOD, small mode and large modeYellow Sea (30N~50N, 120E~150E), 2001~2003

0

0.1

0.2

0.3

0.4

0.5

0.6

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

Month

MO

DIS

AO

D (5

50nm

)

Large mode

Small mode