Atmospheric Ammonia: Sources and Fate. A Review of Ongoing Federal Research and Future Needs Page: 9
13 p. : col. ill., col. mapsView a full description of this text.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Atmospheric Ammonia: Sources and Fate
i3 is
u"
RE.
16 7r
"!i "
:F~*q.
drU 'l*. ! i
A;'i3 1; Iii '.
U 101 :, i 4June 2000
1 k f :"N 1 v k, I "
MlU_ LI " lLP''"r'
- .a- I ,
61 1
. ., "" .- r
.:Jd 1 ei. ..'' 7 "e 1 i ".. i Wl~d LL. Ii
-" " u "
" . - .. ,
.' , :.*=:....
rc' .', , 1 -< '' " .'%'
. . . . ., . ,t
J1 *, "1 1r
iJ-. ,*vi- i . EI rE.
- i .i !.
e, -j-. e-
.r 74 -s,
I., *1~* *. n
rp.I
tie
i D !3
Figure 3. Ammonium ion concentration in precipitation for 1998. National
Atmospheric Deposition Program/National Trends Network'2
A modified Seasonal Kendall analysis of trends in ammonium in precipitation is shown
in Figure 4. The effect of trends in precipitation volume was removed prior to the non-
parametric test for trends in ammonium concentration. Approximately 23% of the sites
had statistically significant (oa < 0.05/n) increasing trends, mostly in the Southeast and
West. Decreasing trends were observed at less than 1% of the sites.S t
f
t-t
i!
r
r r
- r
e t
16t
r1i H Trn.-i
1 I " . 'T
tFigure 4. Trends in ammonium concentration in precipitation for the period 1981-1997.
(USGS, Mark Nilles, private communication)
12 NADP/NTN (http://nadp.sws.uiuc.edu)CENR Air Quality Research Subcommittee
. :,
";
ro.
:, '';
:"L,
; ft.
-%4L
Upcoming Pages
Here’s what’s next.
Search Inside
This text can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Text.
National Science and Technology Council (U.S.). Air Quality Research Subcommittee. Atmospheric Ammonia: Sources and Fate. A Review of Ongoing Federal Research and Future Needs, text, June 2000; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc25995/m1/13/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .