Gert König-Langlo

Alfred Wegener Institut

für Polar- und Meeresforschung

23.06.2016 2

Typical TOA Long-Wave Emission

14th BSRN workshop, Canberra,

April 26-29, 2016

TES-Band

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

3

Typical Spectra from Satellite (Tropospheric Emission Spectrometer)

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

4

Typical Spectra from Satellite (Tropospheric Emission Spectrometer)

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

5

Yearly averaged greenhouse effect of CO2 in 2006

calculated from TES

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

6

Seasonally averaged greenhouse effect of CO2 in 2006,

calculated from TES spectra

DJF

MAM

JJA

SON

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

7

Monthly averaged temperature profiles

from South Pole

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

8

Effect of increasing CO2 on FTOA

using the line-by-line modell ALFIP

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

9

Greenhouse effect of CO2 as a function of

CO2 concentration for temperature profiles from South Pole

23.06.2016 10

Yearly averaged air temperature at Neumayer

14th BSRN workshop, Canberra,

April 26-29, 2016

23.06.2016 11

Temperature trends from observations

A

Synthesis of

Antarctic

Temperature

s (CHAPMAN

et al., 2006)

14th BSRN workshop, Canberra,

April 26-29, 2016

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

12

Summary

• „Global warming“ does not take place in central Antarctica

• The greenhouse effekt (GEH) is extremely week and even

negative in central Antarctica

• Increasing CO2 leads to increasing LW-TOA fluxes over

central Antarctica

• The main reason: The surface in central Antarctica is

frequently colder than the stratosphere

Open Question: Where does the CO2-cooling takes place???

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

13

LWD modelled using ALFIP

(T-profiles from South Pole, no clouds)

23.06.2016 14th BSRN workshop, Canberra,

April 26-29, 2016

14

Summary LWD

Long Wave Downwelling radiation (Fsurf)

• For increasing CO2 the emission height decreases

• For a temperature inversion increasing CO2 leads

to a decrease of Fsurf for the center of the CO2 band

• Overall, an increase in CO2 leads to an increase in Fsurf