Using AIRS to Quantify the Heating Effects of Dust in the Saharan - - PowerPoint PPT Presentation

▶
using airs to quantify the heating effects of dust in the
SMART_READER_LITE
LIVE PREVIEW

Using AIRS to Quantify the Heating Effects of Dust in the Saharan - - PowerPoint PPT Presentation

Dec 02, 2022 190 likes •435 views

Using AIRS to Quantify the Heating Effects of Dust in the Saharan Air Layer Sun Wong 1 , Andrew Dessler 1 , Natalie Mahowald 2 , Ping Yang 1 , and Qian Feng 1 1 Texas A&M University 2 Cornell University (AIRS STM 2008, Pasadena) Aqua MODIS

slide-1
SLIDE 1

Using AIRS to Quantify the Heating Effects

  • f Dust in the Saharan Air Layer

Sun Wong1, Andrew Dessler1, Natalie Mahowald2, Ping Yang1, and Qian Feng1

1Texas A&M University

2Cornell University

(AIRS STM 2008, Pasadena)

slide-2
SLIDE 2

Aqua MODIS Aerosol Optical Thickness (AOT)

?

slide-3
SLIDE 3
  • How important is the Saharan dust in the radiative

heating budget in the SAL?

  • How important is the dry anomaly in the radiative

heating budget in the SAL?

  • Can the heating from dust maintain the warmness
  • f the SAL?
slide-4
SLIDE 4

Aqua MODIS Aerosol Optical Thickness (AOT)

?

slide-5
SLIDE 5

AIRS Saharan Air Layer (SAL)

slide-6
SLIDE 6

AIRS Saharan Air Layer (SAL)

Dunion and Velden, BAMS 2004; Wong and Dessler, GRL, 2005

slide-7
SLIDE 7

0.1-1 µm 1-2.5 µm 2.5-5 µm 5-10 µm

AUG-SEP

Mahowald et al., JGR 2003

slide-8
SLIDE 8

GSFC CLIRAD

(chou et al., 2003) AIRS T (0-0.3 AOT) AIRS q (0-0.3 AOT) Dust (0-0.3 AOT)

H( background) Flx(background)

slide-9
SLIDE 9

GSFC CLIRAD

AIRS T (0-0.3 AOT) AIRS q (0-0.3 AOT) Dust (0-0.3 AOT)

H( background) Flx(background) GSFC CLIRAD

AIRS T (0-0.3 AOT) AIRS q (0-0.3 AOT) Dust (AOT > 0.8)

H(Dust) Flx(Dust)

slide-10
SLIDE 10

GSFC CLIRAD

AIRS T (0-0.3 AOT) AIRS q (0-0.3 AOT) Dust (0-0.3 AOT)

H( background) Flx(background) GSFC CLIRAD

AIRS T (0-0.3 AOT) AIRS q (0-0.3 AOT) Dust (AOT> 0.8)

H(Dust) Flx(Dust) GSFC CLIRAD

AIRS T (0-0.3 AOT) AIRS q (AOT > 0.8) Dust (AOT > 0.8)

H(SAL) Flx(SAL)

slide-11
SLIDE 11
slide-12
SLIDE 12

SAL

slide-13
SLIDE 13

SAL

slide-14
SLIDE 14

SAL

slide-15
SLIDE 15

SAL

slide-16
SLIDE 16

Aqua MODIS Aerosol Optical Thickness (AOT)

?

slide-17
SLIDE 17

0.06 0.04 –0.03 0.06 0.03 –0.04 0.04 0.08 –0.04 0.06 0.11 0.01 0.21 0.30 0.15 20-30W 30-40W 40-60W 0.3-0.4 0.4-0.5 0.5-0.6 0.6-0.8 >0.8 AOT

Heating Against Thermal Cooling at 850 hPa

slide-18
SLIDE 18

Conclusions:

  • Dust radiative heating ~ 50% of the SAL

Heating

  • SAL (dust + low H2O) heating ~ T anomaly

profiles

  • (dust + low H2O) maintains the T anomaly

in the SAL. West of 50°W, SAL of AOT < 0.5 may lose the ability to maintain the T anomaly against thermal relaxation

slide-19
SLIDE 19
slide-20
SLIDE 20
slide-21
SLIDE 21
slide-22
SLIDE 22
slide-23
SLIDE 23
  • Radiative (dust + dryness): GSFC CLIRAD

(Chou et al., 2003)

  • Dynamical: NCEP
  • Horizontal advection:
  • Vertical advection + adiabatic:
  • Latent Heat ???

p T p T

  • +
  • T

v

slide-24
SLIDE 24

SW LW

DUST

+ – – + +

H2O

– –