0 . X. H. Gao and J. L. Stanford* Department of Physics Iowa State University Ames, Iowa 50011 ABSTRACT Low frequency oscillations with periods of approximately one to two months are found in eight years of global grids of total ozone data from the Total Ozone Mapping Spectrometer (TOMS) satellite instrument. The low frequency oscillations corroborate earlier analyses based on four years of data, on the eight-year TOMS data are presented. standing "dipole" in ozone perturbations, oscillating with 35-50 day periods over the equatorial Indian Ocean-west Pacific region. This contrasts with the eastward moving dipole reported in other data sets. The standing ozone dipole appears to be a dynamical feature associated with vertical atmospheric motions. temperature fields, large-scale standing patterns are also found in the extratropics of both hemispheres, correlated with ozone fluctuations over the equatorial west Pacific. In the Northern Hemisphere, a standing pattern is observed extending from the tropical Indian Ocean to the north Pacific, across North America, and down to the equatorial Atlantic Ocean region. This feature is most pronounced in the NH summer. In addition, both annual and seasonal one-point correlation maps based The results clearly show a Consistent with prior analyses based on lower stratospheric (gAS1-CB-184759) LCU FRBCUE&C Y OECIUAZIGIS 189-173€5 Ih 'IOlhL CZCblE CELSCBEEBIPS (loud State - Univ, of Science and lrchnclccy) 16 p CSCL O4B Unclas G3/47 01901E2 *U.S. Pulbright Scholar 1988-89, Dopartmmt of Atmorphoric, Ocoanic. and Planotary Phyricr, Univorrity of Oxford, 0x1 3PU. Unitod Kingdom; and Faculty Improvwaont Loavo, Iowa Stat. Univorrity. 1 https://ntrs.nasa.gov/search.jsp?R=19890008014 2020-03-20T03:30:14+00:00Z
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0
.
X. H. Gao and J. L. Stanford*
Department of Physics Iowa State University Ames, Iowa 50011
ABSTRACT
Low frequency oscillations with periods of approximately one to two months are found in eight years of global grids of total ozone data from the Total Ozone Mapping Spectrometer (TOMS) satellite instrument. The low frequency oscillations corroborate earlier analyses based on four years of data, on the eight-year TOMS data are presented. standing "dipole" in ozone perturbations, oscillating with 35-50 day periods over the equatorial Indian Ocean-west Pacific region. This contrasts with the eastward moving dipole reported in other data sets. The standing ozone dipole appears to be a dynamical feature associated with vertical atmospheric motions. temperature fields, large-scale standing patterns are also found in the extratropics of both hemispheres, correlated with ozone fluctuations over the equatorial west Pacific. In the Northern Hemisphere, a standing pattern is observed extending from the tropical Indian Ocean to the north Pacific, across North America, and down to the equatorial Atlantic Ocean region. This feature is most pronounced in the NH summer.
In addition, both annual and seasonal one-point correlation maps based The results clearly show a
Consistent with prior analyses based on lower stratospheric
(gAS1-CB-184759) LCU FRBCUE&C Y O E C I U A Z I G I S 189-173€5 I h ' I O l h L CZCblE CELSCBEEBIPS (loud S t a t e -
Univ, of S c i e n c e a n d lrchnclccy) 16 p CSCL O4B Unclas G3/47 01901E2
*U.S. Pulbright Scholar 1988-89, Dopartmmt of Atmorphoric, Ocoanic. and Planotary Phyricr, Univorrity of Oxford, 0x1 3PU. Unitod Kingdom; and Faculty Improvwaont Loavo, Iowa Stat. Univorrity.
Solid lines begin at R-0, dashed lines indicate anticorrelations.
(days) as indicated. Data used: eight years (1 Jan. 1980 - 31 Dec. 1987) of TOMS.
Lag time
Fig. 4. Same as Figure 3, but for NH summer (1 April - 30 September).
Fig. 5. Same as Figure 3, but NH winter (1 October - 31 March).
i i
10- L
40 -i
00
15 PERIOD (DAY) 0 20
99.9:: L vv
1 C . L . - 95
35s, l O O W A BW
100 50 30 20 15 PERIOD (DAY 1
F i g . 1 . Power s p e c t r a l d e n s i t y v s . frequency of column t o t a l The spec tra have been smoothed ozone a t 35 S , 100 W and 45 S , 20 E .
with 15-point running means and the r e s u l t i n g bandwidths (BW) a r e i n d i c a t e d . chi-square d i s t r i b u t i o n . i s def ined i n the t e x t .
The C.L. (conf idence l e v e l ) scale i s based on the D . U . s tands for Dobson u n i t s and AF
15 PERIOD (DAY) 100 50 30 20
40 i o 120 160 200 PREWENCY (2922 DAY)-’
I I
2 X
EQ., 175W
100 50 30 20 ‘15 PERIOD (DAY)
40 80 120 160 200 (2922 DAY1-l
Fig. 2. As in F i g . 1 , except spec tra of column t o t a l ozone a t 55 S , 1 2 5 W and 35 S , 140 E , and Equator, 175 W .