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Presence of quasi 27-day oscillations in the atmosphere. Mao-Chang Liang (Academia Sinica and NCU) K. Fai Li, and Yuk L. Yung (Caltech) European Geosciences Union General Assembly 2009 Vienna, Austria, 19 – 24 April 2009. 11-year solar insolation: 0.1\% 11-year Lyman- : 50\%.

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presence of quasi 27 day oscillations in the atmosphere

Presence of quasi 27-day oscillations in the atmosphere

Mao-Chang Liang

(Academia Sinica and NCU)

K. Fai Li, and Yuk L. Yung (Caltech)

European Geosciences Union General Assembly 2009 Vienna, Austria, 19 – 24 April 2009

27 day solar cycle
11-year solar insolation: 0.1%

11-year Lyman-: 50%

27-day UV (200-300 nm): 0.23%

27-day Lyman-: 5%

27-day solar cycle
cosmic occultations in 24 hrs
COSMIC occultations in 24 hrs

(Illustration by Bill Schreiner, UCAR.)

formosat 3 cosmic mission
FORMOSAT-3/COSMIC mission
  • Launch on April 14, 2006
  • 6 satellites orbiting at ~800 km
  • 3 instruments
    • GPS radio occultation receiver
    • Tiny ionospheric photometer
    • Triband beacon
  • 1.7M (neutral) and 1.9M (ionized) soundings (2008.114)
  • ~1500 soundings per day
slide6
355 km

Tropics

Daily mean

5-day running mean

15-day running mean

27-day FFT

54-day FFT

10.7-cm

Lyman-alpha

13.5-day FFT

Lyman-alpha

Liang et al. (2008)

methods
Methods
  • Daily and zonally averaged in 36 latitude bins
  • 30 layers from 1-1000 mbar
  • Traditional Fourier transform, with Hanning window of 20-25 (10-20) days and 35-40 (40-50) days
  • Empirical mode decomposition
    • 27-day mainly in mode #4, sometime leak to mode #3
    • 13.5-day mainly in model #3
  • EMD to remove long periods followed by FFT
  • Running mean window of 60 days
  • CMD & Wavelet
methods1
Methods
  • Daily and zonally averaged in 36 latitude bins
  • 30 layers from 1-1000 mbar
  • Traditional Fourier transform, with Hanning window of 20-25 (10-20) days and 35-40 (40-50) days
  • Empirical mode decomposition
    • 27-day mainly in mode #4, sometime leak to mode #3
    • 13.5-day mainly in model #3
  • EMD to remove long periods followed by FFT
  • Running mean window of 60 days
  • CMD & Wavelet
fft of atmospheric temperature
FFT of atmospheric temperature

35 mbar

22.5N

Lyman-

F10.7 cm

281 mbar

tropics

Liang et al. (submitted)

latitudinal profiles
Latitudinal profiles

35 mbar

281 mbar

Liang et al. (submitted)

vertical profile at low latitudes
Vertical profile at low latitudes

Liang et al. (submitted)

further verification
Further verification

NCEP2

COSMIC+FFT

COSMIC+EMD

AIRS+FFT

Liang et al. (submitted)

cmd of cosmic and mls data
CMD of COSMIC and MLS data

MLS

COSMIC

Li et al. (submitted)

summary and future work
Summary and Future work
  • Presence of quasi 27-day signals in the atmosphere is established
  • A likely source is solar forcing
  • A potentially useful tool for calibrating climate models
  • Analyzing WACCM3 (0-150 km)
thanks you

Thanks you!

Comments?

solar forcing
Solar forcing
  • >>10 kyr of precession, obliquity, eccentricity
  • 70-2300 years cycle
  • 22-year magnetic field cycle
  • 11-year sunspot cycle
  • Annual cycle
  • 27-day cycle
  • Diurnal cycle
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