In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 93, No. D2 ( 1988-02-20), p. 1583-1592
Abstract:
Methane emissions to the troposphere from the Amazon River floodplain have been determined. In total, 94 individual flux measurements were made along a 1,700‐km stretch of the river during the early falling water period of the flood cycle (July–August 1985). The overall average rate of CH 4 emission from wetlands was 390 mg CH 4 m −2 d −1 . Water surfaces covered by aquatic macrophytes had the highest emissions, 590 mg CH 4 m −2 d −1 , while emissions from flooded forests were 110 mg CH 4 m −2 d −1 and open lake areas averaged 120 mg CH 4 m −2 d −1 . Ebullition was the dominant mechanism of emission, accounting for 85% of the total. Surface water dissolved oxygen was always undersaturated, while dissolved CO 2 concentrations were significantly supersaturated with respect to atmospheric equilibrium. Surface water CH 4 concentrations were highly supersaturated, averaging 6.4 μM. The δ 13 C of the CH 4 varied from −42‰ to −73‰ with an apparent trend toward heavier values downstream. Extrapolation to the entire Amazon floodplain results in estimated annual emissions in the troposphere of 10 Tg yr −1 and indicates the importance of the area in the global atmospheric CH 4 cycle.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JD093iD02p01583
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1988
detail.hit.zdb_id:
2033040-6
detail.hit.zdb_id:
3094104-0
detail.hit.zdb_id:
2130824-X
detail.hit.zdb_id:
2016813-5
detail.hit.zdb_id:
2016810-X
detail.hit.zdb_id:
2403298-0
detail.hit.zdb_id:
2016800-7
detail.hit.zdb_id:
161666-3
detail.hit.zdb_id:
161667-5
detail.hit.zdb_id:
2969341-X
detail.hit.zdb_id:
161665-1
detail.hit.zdb_id:
3094268-8
detail.hit.zdb_id:
710256-2
detail.hit.zdb_id:
2016804-4
detail.hit.zdb_id:
3094181-7
detail.hit.zdb_id:
3094219-6
detail.hit.zdb_id:
3094167-2
detail.hit.zdb_id:
2220777-6
detail.hit.zdb_id:
3094197-0
SSG:
16,13
Permalink