Distributional changes in rainfall and river flow in Sarawak, Malaysia

Sa’adi, Zulfaqar; Shahid, Shamsuddin; Ismail, Tarmizi; Chung, Eun‐Sung; Wang, Xiao Jun

doi:10.1007/s13143-017-0051-2

Cited by 65 publications

(54 citation statements)

References 46 publications

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“…River discharge data for the Baram River catchment were provided by the Department of Irrigation and Drainage (DID) in Malaysia 15 . The nearest station to the Baram outflow north of Miri was Marudi station (4.10°N, 114.18°E), which provided continuous data coverage between 1989 and 2015.…”

Section: Methodsmentioning

confidence: 99%

“…In northern Borneo, natural climatic events paired with currently unquantified contributions from climate change may exacerbate the regional anthropogenic impacts on coral reefs. The regional climate is strongly influenced by the Asian-Australian monsoon system [13][14][15] . The winter monsoon usually lasts from November to March, characterized by strong northeasterly winds, colder sea surface temperatures (SSTs), wetter conditions and lower salinities ( Fig.…”

mentioning

confidence: 99%

“…Correlation coefficients and p-values between mean annual and detrended coral-derived δ 18 O sw with EN4 salinity66 , Miri station precipitation84 and Marudi station river discharge15 .…”

mentioning

confidence: 99%

“…Correlation coefficients of Miri rainfall84 , Marudi river discharge15 , gridded salinity (EN4 SSS66 ) and δ 18 O sw of AG and EG with Niño3.4 51 , Niño4 51 and PDO 52 indices averaged over 3 months. All data detrended with 95% confidence intervals indicated in last column.…”

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confidence: 99%

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Corals reveal ENSO-driven synchrony of climate impacts on both terrestrial and marine ecosystems in northern Borneo

Krawczyk

Zinke

Struck

et al. 2020

Sci Rep

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Extreme climate events, such as the El Niños in 1997/1998 and 2015/16, have led to considerable forest loss in the Southeast Asian region following unprecedented drought and wildfires. In Borneo, the effects of extreme climate events have been exacerbated by rapid urbanization, accelerated deforestation and soil erosion since the 1980s. However, studies quantifying the impact of interannual and long-term (>3 decades) climatic and anthropogenic change affecting Borneo's coastal and coral reef environments are lacking. Here, we used coral cores collected in Miri-Sibuti Coral Reefs National Park, Sarawak (Malaysia) to reconstruct the spatio-temporal dynamics of sea surface temperature and oxygen isotopic composition of seawater from 1982 to 2016, based on paired oxygen isotope and Sr/Ca measurements. The results revealed rising sea surface temperatures of 0.26 ± 0.04 °C per decade since 1982. Reconstructed δ 18 o sw displayed positive excursion during major El Niño events of 1983, 1997/98 and 2015/16, indicating drought conditions with less river runoff, rainfall and higher ocean salinities. La Niñas were generally associated with lower δ 18 o sw . We observed a long-term shift from more saline conditions between 1982 and 1995 towards less saline conditions after 1995, which are in agreement with the regional freshening trend, punctuated by saline excursion during El Niños. The decadal shifts were found to be driven by the Pacific Decadal Oscillation (PDO). This study provides the first long-term data on El Niño Southern Oscillation (ENSO)-driven synchrony of climate impacts on both terrestrial and marine ecosystems in northern Borneo. Our results suggest that coral records from northern Borneo are invaluable archives to detect regional enSo and pDo impacts, and their interaction with the Asian-Australian monsoon, on the hydrological balance in the southern South China Sea beyond the past three decades.Southeast Asia (SEA) harbours an astonishing diversity of stony corals, comprising approximately 28% of the global total, located in the Maritime Continent 1,2 . Local ecological threats, such as coastal development, overfishing/destructive fishing and pollution, detrimentally impact 95% of the coral reefs in SEA and are amplified by large-scale global pressures 2 . Over the past 40 years, the Maritime Continent has undergone intense economic development and urbanization, drastically increasing human-induced pressures on the marine coastal ecosystems 3-6 . In Borneo, rapid urbanization of coastal zones and expansion of palm oil plantations has resulted in some of the highest levels of deforestation among all humid tropical regions of the world 7-10 . Approximately 26% of old-growth rainforest has been lost since the early 1970s 7-10 . Anthropogenic land-use change can severely impact the erosion potential of the hinterland soils, as well as the freshwater and sediment discharge into the nearshore environment, which in turn alters water quality on coral reefs 11,12 . rainfall occurs in April and October in any given ye...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

“…Correlation coefficients and p-values between mean annual and detrended coral-derived δ 18 O sw with EN4 salinity66 , Miri station precipitation84 and Marudi station river discharge15 .…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Corals reveal ENSO-driven synchrony of climate impacts on both terrestrial and marine ecosystems in northern Borneo

Krawczyk

Zinke

Struck

et al. 2020

Sci Rep

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“…Rainfall is abundant throughout the year but is pronounced during the northeastern monsoon, which occurs between November and February (wet season). The period from May to September, before the southwestern monsoon, constitutes the dry season (Sa'adi et al, 2017). About 12 % of the coastal area of western Sarawak is covered by peatlands, of which approximately 41 % has been converted to palm plantations (Müller et al, 2016).…”

Section: Study Areas and Sample Collectionmentioning

confidence: 99%

Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia

Chang

Müller

et al. 2020

Biogeosciences

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Selenium (Se) is an essential micronutrient for aquatic organisms. Despite its importance, our current knowledge of the biogeochemical cycling of dissolved Se in tropical estuaries is limited, especially in Southeast Asia. To gain insights into Se cycling in tropical peat-draining rivers and estuaries, samples were collected from the Rajang, Maludam, Sebuyau, Simunjan, Sematan, Samunsam and Lunda rivers and estuaries in western Sarawak, Malaysia, in March and September 2017 and analysed for various forms of Se (dissolved inorganic and organic). Mean total dissolved Se (TDSe), dissolved inorganic Se (DISe) and dissolved organic Se concentrations (DOSe) were 2.2 nmol L −1 (range: 0.7 to 5.7 nmol L −1 ), 0.18 nmol L −1 (range: less than the detection limit to 0.47 nmol L −1 ) and 2.0 nmol L −1 (range: 0.42 to 5.7 nmol L −1 ), respectively. In acidic, low-oxygen, organicrich blackwater (peatland-draining) rivers, the concentrations of DISe were extremely low (near or below the detection limit, i.e. 0.0063 nmol L −1 ), whereas those of DOSe were high. In rivers and estuaries that drained peatland, DOSe / TDSe ratios ranged from 0.67 to 0.99, showing that DOSe dominated. The positive relationship between DISe and salinity and the negative relationship between DOSe and salinity indicate marine and terrestrial origins of DISe and DOSe, respectively. The positive correlations of DOSe with the humification index and humic-like chromophoric dissolved organic matter components in freshwater river reaches suggest that peat soils are probably the main source of DOSe.The DOSe fractions may be associated with high molecular weight peatland-derived aromatic and black carbon compounds and may photodegrade to more bioavailable forms once transported to coastal waters. The TDSe flux delivered by the peat-draining rivers exceeded those reported for other small rivers and is quantitatively more significant than previously thought.

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Low biodegradability of dissolved organic matter from Southeast Asian peat-draining rivers

Nichols

Martin

2021

Preprint

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Low biodegradability of peatland dissolved organic carbon during 56-day incubations, including when diluted with seawater or amended with nutrients • No measurable phenol oxidase activity in the peat-draining rivers and coastal waters of Sarawak • Autoxidation of the phenol oxidase assay substrate L-3,4dihydroxyphenylalanine occurs at pH ≥ 7; we recommend ultrafiltration to generate enzymefree controls Supporting Information: Supporting Information may be found in the online version of this article.

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Distributional changes in rainfall and river flow in Sarawak, Malaysia

Cited by 65 publications

References 46 publications

Corals reveal ENSO-driven synchrony of climate impacts on both terrestrial and marine ecosystems in northern Borneo

Corals reveal ENSO-driven synchrony of climate impacts on both terrestrial and marine ecosystems in northern Borneo

Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia

Low biodegradability of dissolved organic matter from Southeast Asian peat-draining rivers

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