Interpretation of El Niño–Southern Oscillation‐related precipitation anomalies in north‐western Borneo using isotopic tracers

Kurita, Naoyuki; Horikawa, Makoto; Kanamori, Hitoshi; Fujinami, Hatsuki; Kumagai, Tomo’omi; Kume, Tomonori; Yasunari, Tetsuzo

doi:10.1002/hyp.13164

Cited by 9 publications

(6 citation statements)

References 67 publications

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“…Daily rainfall amounts range from 0 to 300.3 mm/day ( Figure 1e) averaging 13.8 ± 22.4 mm/day. Seasonal variability is absent in both rainfall amount and in δ 18 O R , consistent with previous studies in N. Borneo (Kurita et al, 2018;Moerman et al, 2013).…”

Section: Rainfall δ 18 O Variability Across Enso Extremessupporting

confidence: 92%

Extended Cave Drip Water Time Series Captures the 2015–2016 El Niño in Northern Borneo

Ellis

Cobb

Moerman

et al. 2020

Geophysical Research Letters

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Time series of cave drip water oxygen isotopes (δ18O) provide site‐specific assessments of the contributions of climate and karst processes to stalagmite δ18O records employed for hydroclimate reconstructions. We present ~12‐year‐long time series of biweekly cave drip water δ18O variations from three sites as well as a daily resolved local rainfall δ18O record from Gunung Mulu National Park in northern Borneo. Drip water δ18O variations closely match rainfall δ18O variations averaged over the preceding 3–18 months. We observe coherent interannual drip water δ18O variability of ~3‰ to 5‰ related to the El Niño–Southern Oscillation (ENSO), with sustained positive rainfall and drip water δ18O anomalies observed during the 2015/2016 El Niño. Evidence of nonlinear behavior at one of three drip water monitoring sites implies a time‐varying contribution from a longer‐term reservoir. Our results suggest that well‐replicated, high‐resolution stalagmite δ18O reconstructions from Mulu could characterize past ENSO‐related variability in regional hydroclimate.

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Section: Rainfall δ 18 O Variability Across Enso Extremessupporting

confidence: 92%

Extended Cave Drip Water Time Series Captures the 2015–2016 El Niño in Northern Borneo

Ellis

Cobb

Moerman

et al. 2020

Geophysical Research Letters

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“…The latter is not surprising since winter precipitation in Borneo was reduced by more than 50% during the 1997/98 El Niño event 69 1996,[1999][2000][2001]2008 and 2011 negative δ 18 O sw were observed in agreement with lower SSS and higher river discharge. Several other paleoclimate studies in the SCS on corals from the northern SCS 48 , a speleothem record from northwestern Borneo 70 and the δ 18 O of rainfall interannual anomalies at Gunung Mulu and Lambir Hills National Parks in northern Borneo have also shown clear ENSO impacts 62,63 . The proxy records together with the rainfall isotope data support the observed pattern of anomalously low precipitation and droughts in the Maritime Continent during El Niño 71,72 .…”

Section: Discussionmentioning

confidence: 89%

“…Coral-derived δ 18 O sw from AG and EG exhibited significant correlation with ocean SSS (offshore grid), local precipitation and river discharge suggesting that the coral record can provide reliable information on changes in the hydrological balance in reef waters. Regional monitoring of oxygen isotopes in rainfall between 2004 and 2011 upstream and downstream in the Baram catchment (Mulu and Lambir Hills National Park) indicated a clear inverse relationship with the amount of rainfall 62,63 . Therefore, δ 18 O of seawater around Miri is influenced by the balance between precipitation and evaporation (the P-E balance), and freshwater runoff.…”

Section: Discussionmentioning

confidence: 99%

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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“…In the context of long‐term isotope monitoring (>5 years), stable isotopes are useful tracers of ENSO‐induced anomalies (Sánchez‐Murillo, Durán‐Quesada, Birkel, Esquivel‐Hernández, & Boll, ). Kurita et al () evidenced that ENSO modulates the frequency of synoptic conditions on a seasonal and longer time scale, showing a strong correlation between the seasonal isotopic anomalies and the Southern Oscillation Index. dos Santos et al () provided a comparison of daily stable isotope composition during the strongest ENSO event from the instrumental record (1997/1998) and the most recent strong event (2015–2016) in Brazil.…”

Section: Atmosphere–ocean Processesmentioning

confidence: 99%

“…Current ability to monitor and analyse observed changes in the hydrological cycle under warming linked to ENSO development allows for the possibility of improving our knowledge of the global warming driven intensification of the hydrological cycle. In the context of longterm isotope monitoring (>5 years), stable isotopes are useful tracers of ENSO-induced anomalies(Sánchez-Murillo, Durán-Quesada, Birkel, Esquivel-Hernández, & Boll, 2017) Kurita et al (2018). evidenced that ENSO modulates the frequency of synoptic conditions on a seasonal and longer time scale, showing a strong correlation between the seasonal isotopic anomalies and the Southern Oscillation Index.…”

mentioning

confidence: 99%

Preface to stable isotopes in hydrological studies in the tropics: Ecohydrological perspectives in a changing climate

Sánchez‐Murillo

Durán-Quesada

2019

Hydrological Processes

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Interpretation of El Niño–Southern Oscillation‐related precipitation anomalies in north‐western Borneo using isotopic tracers

Cited by 9 publications

References 67 publications

Extended Cave Drip Water Time Series Captures the 2015–2016 El Niño in Northern Borneo

Extended Cave Drip Water Time Series Captures the 2015–2016 El Niño in Northern Borneo

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

Preface to stable isotopes in hydrological studies in the tropics: Ecohydrological perspectives in a changing climate

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