USGS

Magmatic Carbon Dioxide Emissions at Mammoth Mountain, California

By Christopher D. Farrar, John M. Neil, and James F. Howle

U.S. GEOLOGICAL SURVEY
Water-Resources Investigations report 98-4217
Sacramento, California 1999


Table 4. Summary of carbon dioxide flux (emission rate) measurements, Mammoth Mountain, California, summer 1996
[(g/m2)/d, grams per square meter per day; Mg/d, megagrams, per day; -, no data]
                                         Carbon dioxide flux statistics
                                         ------------------------------          Esti-
              Area of   Area of  Number  Mini-   Maxi-                 Standard  mated
Location     emission  tree-kill  of 3    mum     mum      Mean  Med-    devi-   total 
              (hect-    (hect-   measure-                        ian     ation   flux
              ares)     ares)    ments                                          (Mg/d)
----------------------------------------------------------------------------------------                                                                              
Horseshoe Lake  16       12       31      39     5,640      935    395   1,188   113
Borrow Pit       2.8      1.4     11      76     6,652    1,358    788   1,920    20
Chair 12         6.8      4.6     20      53     3,058    1,001    618   1,079    48
Lodge            2.3    (1)       28       0       353       73     42      90     2
Mammoth Mtn. 
 Fumarole         .5    (2)       17       8     8,050    1,206    290   2,092     6
Reds Creek      14.2     10.2     45       0    30,950    2,947    510   6,937   308
Reds Lake        2.3    (1)        2     960     1,952    1,506     --      --    22
Saddle            .5    (2)       24       0     4,769      313     10   1,021     2
Southside        2.2      2.2     18       3       737      217    138     209     5
Upper Dry Creek <1      (2)        9        .3     594      125      6     234     0
----------------------------------------------------------------------------------------
TOTALS          48       36                                                      526

1 Tree-kill is spotty over a large area; the boundary was not mapped.
2 Area is above tree line of mostly devoid of trees.
3 For Horseshoe Lake, Borrow Pit, Chair 12, and Reds Creek, only values for points inside tree kill boundaries are included. See table 2 for complete listing of all sample points and flux values.


| Table 1 | Table 2 | Table 3 | Table 4 |