A preliminary estimate of organic carbon transport by the Ayeyarwady (Irrawaddy) and Thanlwin (Salween) Rivers of Myanmar

Bird, Michael I.; Robinson, R. W.; Oo, N.; Aye, Maung Maung; Lu, Xixi; Higgitt, David; Swe, Aung; Tun, Tin; Win, Swe Lhaing; Aye, K. Sandar; Win, K. Mi Mi; Hoey, Trevor

doi:10.1016/j.quaint.2007.08.003

Cited by 79 publications

(48 citation statements)

References 25 publications

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“…To help partition the source of organic carbon exported between potential sources, we measured the d 13 C of DOC and POC, and the molar C : N ratio of dissolved and particulate solids (Bird et al 1995(Bird et al , 2008. The molar C : N ratios for DOC and POC decrease with increasing discharge (Fig.…”

Section: Methodsmentioning

confidence: 99%

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Bass

Bird

Liddell

et al. 2011

Limnology & Oceanography

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In small catchments with rapid flood pulses, detailed temporal data are essential because high-discharge events can be measured in hours and days, rather than weeks and months. Using high-resolution (15 min) sampling, we studied the dynamics of aquatic dissolved and particulate organic carbon (DOC and POC) export through episodic discharge events in a small pristine rainforest catchment in northeast Australia between November 2009 and March 2010. High temporal resolution using this instrumentation requires extensive calibration with concurrent field sampling. The concentration of DOC and POC peaked during times of high stream discharge, reflecting an increased mobilization of soil-water carbon stocks. DOC was the major form of organic carbon in the stream (, 70% of the total carbon export). The majority of total organic carbon exported from the catchment (84%) occurred during significant discharge events (discharge . 50 L s 21 ), which occurred only 9% of the time. Export of DOC and POC totaled 195 and 68 kg km 22 month 21 , respectively, with a DOC : POC ratio of 2.9 6 0.9. If this subcatchment was sampled at weekly intervals the lateral export of carbon would have been underestimated by between 49% and 78% for DOC and POC, respectively. Preliminary d 13 C and molar C : N values of the dissolved and particulate matter suggest that during discharge events, less microbially processed material from the upper soil layers dominated organic matter export, with the opposite being true in nonflood conditions. Not only will the quantities of organic matter exported change in different discharge conditions, but the source and quality may also shift. This study reveals that a field-portable instrument for DOC and POC quantification can yield robust, high-temporal-resolution carbon budget estimates, though detailed, site-specific calibration is essential.

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Section: Methodsmentioning

confidence: 99%

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Bass

Bird

Liddell

et al. 2011

Limnology & Oceanography

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“…The sediments brought by the Irrawaddy and the Salween Rivers are deposited in the Northern and Eastern Andaman Shelf with a width of more than 170 km. A significant amount of terrestrial organic matter brought by these rivers is deposited along with them influencing the long-term carbon cycle (France-Lanord and Derry, 1997;Bird et al, 2008;Ramaswamy et al, 2008). The sources of these sediments deposited on Northern and Eastern Andaman Shelf and the factors controlling the erosion of this large volume of sediments are poorly constrained due to complicated logistic and political reasons associated with their sampling.…”

Section: Introductionmentioning

confidence: 99%

Lithology, Monsoon and Sea-Surface Current Control on Provenance, Dispersal and Deposition of Sediments over the Andaman Continental Shelf

et al. 2016

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“…Off the ridge, sedimentation rates are high (10 cm ka −1 , Rodolfo, 1969). An unusually high content of terrestrial organic carbon has been reported for these sediments (Keller and Richards, 1967;Colin et al, 1999;Bird et al, 2008;Ramaswamy et al, 2008,), which may be favorable of formation of gas within the drift deposits. Jintasaeranee et al (2012) reported gas-charged sediment at the Mergui Ridge slope area from subbottom profiler data (Fig.…”

Section: Instable Drift Depositsmentioning

confidence: 86%

“…The purple dot shows the position of a sediment core discussed by Rodolfo (1969). The bathymetry has been reproduced from SRTM30 PLUS (Becker et al, 2009). Basin in the west and the Mergui Basin in the east and southeast (Fig. 1).…”

Section: Regional Settingmentioning

confidence: 99%

Submarine mass wasting and associated tsunami risk offshore western Thailand, Andaman Sea, Indian Ocean

Schwab

Krastel

Grün

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. 2-D seismic data from the top and the western slope of Mergui Ridge in water depths between 300 and 2200 m off the Thai west coast have been investigated in order to identify mass transport deposits (MTDs) and evaluate the tsunamigenic potential of submarine landslides in this outer shelf area. Based on our newly collected data, 17 mass transport deposits have been identified. Minimum volumes of individual MTDs range between 0.3 km 3 and 14 km 3 . Landslide deposits have been identified in three different settings: (i) stacked MTDs within disturbed and faulted basin sediments at the transition of the East Andaman Basin to the Mergui Ridge; (ii) MTDs within a pile of drift sediments at the basin-ridge transition; and (iii) MTDs near the edge of/on top of Mergui Ridge in relatively shallow water depths (< 1000 m). Our data indicate that the Mergui Ridge slope area seems to have been generally unstable with repeated occurrence of slide events. We find that the most likely causes for slope instabilities may be the presence of unstable drift sediments, excess pore pressure, and active tectonics. Most MTDs are located in large water depths (> 1000 m) and/or comprise small volumes suggesting a small tsunami potential. Moreover, the recurrence rates of failure events seem to be low. Some MTDs with tsunami potential, however, have been identified on top of Mergui Ridge. Mass-wasting events that may occur in the future at similar locations may trigger tsunamis if they comprise sufficient volumes. Landslide tsunamis, emerging from slope failures in the working area and affecting western Thailand coastal areas therefore cannot be excluded, though the probability is very small compared to the probability of earthquake-triggered tsunamis, arising from the Sunda Trench.

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A preliminary estimate of organic carbon transport by the Ayeyarwady (Irrawaddy) and Thanlwin (Salween) Rivers of Myanmar

Cited by 79 publications

References 25 publications

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Lithology, Monsoon and Sea-Surface Current Control on Provenance, Dispersal and Deposition of Sediments over the Andaman Continental Shelf

Submarine mass wasting and associated tsunami risk offshore western Thailand, Andaman Sea, Indian Ocean

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