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Message Subject New Chemtrail Poll: Do you believe in Chemtrails?
Poster Handle George B
Post Content
1) The decade of 1990s had a dip in stratospheric aerosols.  This dip (see below) was caused  by the clearing of the atmosphere in the 90s.

"Hofmann and coworkers (12–14) argued that the “background” stratospheric aerosol layer increased by 5- 9%/year through the 1960s, 1970s, and 1980s, and again at about 5-7% in the 2000s. However, in the 1990s stratospheric aerosols decreased by similar magnitudes. "
[link to junksciencecom.files.wordpress.com]


2) Within the same article cited above are definitive statements that stratospheric particulate (aerosols) increased during the late  1990s - 2000s effectively reversing the negative trend in the early 1990s using three different methods . . . 


"Multiple instruments have been used at Mauna Loa for estimating or measuring total aerosol optical depth and atmospheric transmission. Here we present observations taken there on the cleanest days, when much of the aerosol burden likely resides in the stratosphere. Figure 2 shows three independent data records that all indicate increases in aerosol optical depth (or, equivalently, decreases in transmission) at Mauna Loa from the late 1990s to the late 2000s: from ground-based transmission data using the pyrheliometer ratioing methodology (20, 21), a Precision Filter Radiometer [1999 to date (22)], and a stratospheric lidar (14). Figure 2 compares these data to the mean tropical and global stratospheric aerosol optical depths from combined satellite observations by the Stratospheric Aerosol and Gas Experiment (SAGE) II (1990–2005), Global Ozone Monitoring by Occultation of Stars (GOMOS, 2002-2009) and the CALIPSO lidar (2006–2010), see (16, 17, 23–25); the overlapping periods of the different satellite instruments allow accurate quantification of the trends over time (17). The four independent data sets from satellite, lidar, total transmission, and aerosol optical depth as shown in Fig. 2 jointly support the view that the “background” stratospheric aerosol layer has changed significantly over about the past decade [see (25)]."

[link to junksciencecom.files.wordpress.com]

[link to data.giss.nasa.gov] [/EX]

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14. D. J. Hofmann, J. Barnes, M. O’Neill, M. Trudeau, R.Neely, Geophys. Res. Lett. 36, L15808,


GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L15808, 5 PP., 2009
doi:10.1029/2009GL039008

Increase in background stratospheric aerosol observed with lidar at Mauna Loa Observatory and Boulder, Colorado

David Hofmann
Earth System Research Laboratory, NOAA, Boulder, Colorado, USA

[link to www.agu.org]

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