12 Meter Telescope - Tipping Radiometer Archive

The following table contains a compilation of our 225 GHz tipping radiometer measurements from the 12m telescope. Months where there is no opacity information are indicated with "nd". Months which have not yet been processed (or observed) are indicated with "...". Each of the plots below shows the cumulative distribution of the 225 GHz opacity for the indicated month and year as measured by our 225 GHz tipping radiometer. On the lower left portion of each plot we also show the quartiles for the associated measurements. We have also compiled summaries of the median 225 GHz opacity for the years 1993, 1994, 1995, 1996, 1997, 1998, 1999. (We also have Postscript versions of these plots for the years 1993, 1994, 1995, 1996, 1997, 1998, 1999).

NRAO 12m Atmospheric Opacity Archive
2001			2000			1999
Month	Median tau_z(225)	ps plot	Month	Median tau_z(225)	ps plot	Month	Median tau_z(225)	ps plot
January	...	ps	January	0.17	ps	January	0.13	ps
February	...	ps	February	0.18	ps	February	0.13	ps
March	...	ps	Mar	0.19	ps	Mar	0.12	ps
April	...	ps	April	0.18	ps	April	0.16	ps
May	...	ps	May	0.27	ps	May	0.21	ps
June	...	ps	June	...	ps	June	0.43	ps
July	...	ps	July	...	ps	July	1.56	ps
August	...	ps	August	...	ps	August	1.96	ps
September	...	ps	September	...	ps	September	0.75	ps
October	...	ps	October	...	ps	October	0.20	ps
November	...	ps	November	...	ps	November	0.19	ps
December	...	ps	December	...	ps	December	0.13	ps

1998			1997			1996
Month	Median tau_z(225)	ps plot	Month	Median tau_z(225)	ps plot	Month	Median tau_z(225)	ps plot
January	0.16	ps	January	0.31	ps	January	0.18	ps
February	0.24	ps	February	0.13	ps	February	0.34	ps
March	0.20	ps	Mar	0.14	ps	Mar	0.19	ps
April	0.17	ps	April	0.24	ps	April	0.28	ps
May	0.21	ps	May	0.34	ps	May	0.19	ps
June	0.28	ps	June	0.27	ps	June	0.49	ps
July	1.40	ps	July	0.34	ps	July	1.85	ps
August	1.45	ps	August	nd	ps	August	1.58	ps
September	0.82	ps	September	1.05	ps	September	0.89	ps
October	0.26	ps	October	0.25	ps	October	0.19	ps
November	0.19	ps	November	0.15	ps	November	0.18	ps
December	0.18	ps	December	0.14	ps	December	0.14	ps

1995			1994			1993
Month	Median tau_z(225)	ps plot	Month	Median tau_z(225)	ps plot	Month	Median tau_z(225)	ps plot
January	0.36	ps	January	0.31	ps	January	nd	ps
February	0.42	ps	February	0.37	ps	February	0.26	ps
Mar	0.37	ps	Mar	0.47	ps	Mar	0.25	ps
April	0.21	ps	April	0.44	ps	April	0.26	ps
May	0.32	ps	May	0.52	ps	May	nd	ps
June	0.23	ps	June	0.73	ps	June	0.45	ps
July	0.72	ps	July	nd	ps	July	1.69	ps
August	1.77	ps	August	nd	ps	August	nd	ps
September	1.12	ps	September	1.13	ps	September	nd	ps
October	0.23	ps	October	0.41	ps	October	0.59	ps
November	0.25	ps	November	0.24	ps	November	0.35	ps
December	0.23	ps	December	0.22	ps	December	0.31	ps

Last modified 08 June 2000; Webmaster