Greetings! I located information from various sources including a
report from the TSR&TP Spring Research Symposium:
"In 1970, Lake Tahoe began developing a green margin, and in the early
1990s, Tahoe saw large increases in algal growth. Lake Tahoe was a
classic nitrogen-limited lake, but now with increases in nitrogen
inputs, phosphorous is the dominant limiting factor for algal growth.
Air pollution is suspected to be the major source of nitrogen.
According to Goldman, more than 50% of the nitrogen loading in Lake
Tahoe comes out of the atmosphere."
From http://www.tsrtp.ucdavis.edu/newsletters/spring_2001/Symposium.html
"The Lake Tahoe Air Quality Research Scoping Document: Determing the
Link Between Water Quality, Air Quality and Transportation" (a 93 page
report) is located at http://www.trpa.org/TRPA%20Scoping%20Doc.pdf in
PDF form. Goldman's research is cited in this report.
From a report "Contribution of Basin Watersheds and Atmospheric
Deposition to Eutrophication at Lake Tahoe, CA-NV, USA"
(http://trg.ucdavis.edu/research/annualreport/contents/nutrient/article18.html)
by John E. Reuter, Alan D. Jassby, Charles R. Goldman and Alan C.
Heyvaert:
Atmospheric deposition 233.9 (56%) 12.4 (27%) 5.6 (33%)
Stream loading 81.6 (20%) 13.3 (29%) 2.4 (14%)
Direct runoff 41.8 (10%) 15.5 (34%) 5.0 (29%)
Groundwater 60 (14%) 4 (9%) 4 (24%)
Shoreline erosion 0.75 (<1%) 0.45 (1%) No Data
The site http://lawr.ucdavis.edu/hyd/hydggbro/hydroscigg.htm lists
course information which includes Professor Goldman's contact
information at the university. To receive an exact quote from him
regarding what you seek, or to ask if he can point you to another of
his published sources, I suggest you contact him directly:
Charles R. Goldman, Professor
Division of Environmental Studies
Ph.D., University of Michigan
(530) 752-1557; crgoldman@ucdavis.edu
Should you need further clarification before rating, please ask and I
will be happy to conduct additional research.
SEARCH PHRASES:
Lake Tahoe pollution vehicular emissions
Lake Tahoe pollution vehicular emissions Goldman
Lake Tahoe pollution Goldman
Lake Tahoe pollution Goldman 60%
Lake Tahoe local atmospheric deposition emissions Goldman
Lake Tahoe local atmospheric deposition vehicular emissions Goldman
within basin |
Clarification of Answer by
journalist-ga
on
09 Nov 2002 14:40 PST
Thank you SO much for your patience and I have heard from Dr. Goldman!
Below you will see my query in parentheses and then Dr. Goldman's
response afterwards with quotation marks - I am reproducing the email
as I received it as Dr. Goldman inserted his comments into my email in
an alternate color:
(Greetings Dr. Goldman: I have a question for you concerning "how much
pollution to Lake Tahoe is generated from within the Lake Tahoe basin
from atmospheric deposition (vehicular emissions), as opposed to
atmospheric deposition that is generated from outside the basin and
which blows in from surrounding areas.")
[Dr. Goldman] "We lack good information on what comes over the ridge
tops, since we have been unable to get stations funded for the
ridgetops, but fingerprinting of basin pollution indicates that it
is primarily inbasin generated. Nitrous oxides from Cars (NOx) and
dust for example as atmospheric loading contributes about 65% of the
nitrogen loading to the lake. I[Goldman, Charles] n years past we had
concentrated on stream in puts which do not equal atmospheric inputs."
(The person who needs this information asked a question at Google
Answers where I am a Researcher. I have researched the question in
depth but cannot ascertain the percentage from online sources. The
remainder of the person's question reads: "Dr. Ronald Goldman of the
UC Davis Tahoe Research Group is the most well known researcher of
Lake Tahoe and pollution issues associated with the lake, and
mentioned in a recent seminar that some estimates are that 60% of
atmospheric deposition to the lake blows into the basin from other
urban areas, including Sacramento and San Francisco. I need these
kinds of statistics in written form.")
[Dr. Goldman] "That had to be me, Charles R. Goldman, Director of the
Tahoe Research Group, Univ. of Calif. Davis. since I have 43 years of
experience at Tahoe now, He has it wrong , however , since he seems to
have confused the inbasin lake loading from the atmosphere that we
have data on with the unknown out of basin contribution. According to
Dr. Tom Cahill's high tech "fingerprinting" air pollution and
resulting nutrient loading from the air is mostly in basin generated.
Some obvious visual evidence for this is the smog you see on busy
weekends at Tahoe and during inversions which trap the atmospheric
pollutants."
(Is this percentage the person seeks (or statistics) available online
in a public database or in print? If so, could you tell me the
location online or cite the publication in which it is published?)
[Dr. Goldman] "Our best reference are in Limnology and Oceanography,
the most respected journal in field. An Atmospheric paper by Jassby
et al 1995 , Long term changes in Lake Tahoe (California -Nevada) and
its relation to atmospheric deposition of algal nutrients Arch.
Hydrobiol. 135(1):1-21."
(Should you need to view the Google Answers question concerning this
query, you will locate it online at
https://answers.google.com/answers/main?cmd=threadview&id=95377#a. If
you should send me the information, I would also need your permission
to share the contents of the email in my answer clarification.)
[Dr. Goldman] "No problem sending this on to the inquiry. If he sends
me an e mail I can forward some Tahoe Jounal articles to him or her.
crgoldman "
Dr. Goldman's email address is crgoldman@ucdavis.edu
I hope his comments adequately answer your question and should you
need further clarification before rating my answer, please request it
and I'll be happy to conduct further research in this area.
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