摘要:

Measurements are reported in this paper which indicate the nature of the enhancement of the stratospheric aerosol layer by month for the first full year following the Spring 1982 eruptions of El Chichon. The aerosol optical depths as a function of wavelength are obtained by differencing mean monthly values obtained before and after the eruptions. The first enhancement above background was detected in September 1982. The inverted size distributions indicate a steady increase to larger mean size particles each month with a radius near 0.6 micrometers during the last reported month of March 1983. This size is considerably larger than that which is generally assumed for the sulfuric acid aerosols which form following an eruption.

ISSN:0094-8276    

DOI:10.1029/GL011i001p00076

年代:1984

数据来源: WILEY

摘要:

Vertical profiles of scalar horizontal winds have been measured at high resolution (10m) in the 13 to 37 km region of the stratosphere. This resolution (at that range of altitude) represents the state‐of‐the‐art, and is unique. Our goal was to ascertain whether or not the internal waves of the stratosphere behave consistently with the Garrett‐Munk model which was originally created for oceanic internal waves. The power spectral densities (PSD's) of five profiles are presented and it is found that (a) they closely fit a straight line on a log‐log graph even to wavelengths as small as 40m, and (b) the average slope is −2.7 ± .2 (standard error = 0.1). We conclude that (a) stratospheric internal waves obey the Garrett‐Munk model for vertical wave numbers, and (b) there is no statistically significant evidence for a break in the curve at high wave numbers when due allowance is made for al

ISSN:0094-8276    

DOI:10.1029/GL011i001p00080

年代:1984

数据来源: WILEY

摘要:

Interferometric measurements of nightglow 630.0 nm doppler shifts and widths have yielded determinations of the meridional, zonal and vertical velocities and the temperature in the midlatitude thermosphere during the Priority Regular World Day 18 May 1983. Both the meridional and zonal velocities exhibit a diverging flow in the early night, changing to a converging flow in the later night. Associated with this are apparent, large vertical velocities (20‐30 m/s), upward in the early night, downward in the later night and back upward at the end, which also correlate with decreases and increases in the neutral temperature. While the sense of these observed effects is in agreement with the behavior predicted by existing hydrodynamic models of thermospheric flow, the magnitudes are either much larger (vertical velocities) or much smaller (temperature changes) than the model prediction

ISSN:0094-8276    

DOI:10.1029/GL011i001p00084

年代:1984

数据来源: WILEY

ISSN:0094-8276    

DOI:10.1029/GL011i001p00088

年代:1984

数据来源: WILEY

ISSN:0094-8276    

DOI:10.1029/GL011i001p00090

年代:1984

数据来源: WILEY

ISSN:0094-8276    

DOI:10.1029/GL011i001p00091

年代:1984

数据来源: WILEY

ISSN:0094-8276    

DOI:10.1029/GL011i001p00092

年代:1984

数据来源: WILEY