Spatial and Temporal Variations in Rainfall and the ENSO-rainfall Relationship over Sarawak, Malaysian Borneo

Gomyo, Mie; Kuraji, Koichiro

doi:10.2151/sola.2009-011

Cited by 17 publications

(6 citation statements)

References 11 publications

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“…Complex Coupled Global Circulation Models suggest that ENSO frequency and magnitude under global warming are still unclear [37] . In addition, the ENSO–rainfall relationship may vary geographically, even within a region [38] , [39] . Further study is required to examine the combined effect of global climate change and ENSO on GF.…”

Section: Discussionmentioning

confidence: 99%

Geographical Pattern and Environmental Correlates of Regional-Scale General Flowering in Peninsular Malaysia

et al. 2013

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In South-East Asian dipterocarp forests, many trees synchronize their reproduction at the community level, but irregularly, in a phenomenon known as general flowering (GF). Several proximate cues have been proposed as triggers for the synchronization of Southeast Asian GF, but the debate continues, as many studies have not considered geographical variation in climate and flora. We hypothesized that the spatial pattern of GF forests is explained by previously proposed climatic cues if there are common cues for GF among regions. During the study, GF episodes occurred every year, but the spatial occurrence varied considerably from just a few forests to the whole of Peninsular Malaysia. In 2001, 2002 and 2005, minor and major GF occurred widely throughout Peninsular Malaysia (GF2001, GF2002, and GF2005), and the geographical patterns of GF varied between the episodes. In the three regional-scale GF episodes, most major events occurred in regions where prolonged drought (PD) had been recorded prior, and significant associations between GF scores and PD were found in GF2001 and GF2002. However, the frequency of PD was higher than that of GF throughout the peninsula. In contrast, low temperature (LT) was observed during the study period only before GF2002 and GF2005, but there was no clear spatial relationship between GF and LT in the regional-scale episodes. There was also no evidence that last GF condition influenced the magnitude of GF. Thus, our results suggest that PD would be essential to trigger regional-scale GF in the peninsula, but also that PD does not fully explain the spatial and temporal patterns of GF. The coarse relationships between GF and the proposed climatic cues may be due to the geographical variation in proximate cues for GF, and the climatic and floristic geographical variations should be considered to understand the proximate factors of GF.

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Section: Discussionmentioning

confidence: 99%

Geographical Pattern and Environmental Correlates of Regional-Scale General Flowering in Peninsular Malaysia

et al. 2013

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“…Monsoon and ENSO are two of the most influential forces modulating surface climate in the SE Asia (Dambul 2010). Previous studies in Indonesia and Malaysia, have established a significant relationship between rainfall variability and ENSO events (Aldrian & Susanto 2003;Chang et al 2004;Gomyo & Koichiro 2009;Tangang & Juneng 2004). To be more specific, positive correlation has been observed between SE Asia rainfall anomalies (SEAR) and ENSO evolution, where precipitation patterns are found to be highly affected by the irregular ENSO-related sea surface temperature (SST) anomalies (Juneng & Tangang 2005).…”

Section: Precipitation Anomalies-enso Eventmentioning

confidence: 97%

Water Quality and Aquatic Insects Study at the Lower Kinabatangan River Catchment, Sabah: In Response to Weak La Niña Event

Harun¹,

Al‐Shami²,

Dambul³

et al. 2015

JSM

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“…Additionally, several climate phenomena influence the local climate (i.e. temperature, rainfall, and river runoff), although to a lesser degree (Gomyo and Kuraji, 2009;Yan et al, 2015;Sa'adi et al, 2017b;Pan et al, 2018). These include the El Niño-Southern Oscillation (ENSO) creating dry (wet) conditions during El Niño (La Niña) (Murphy, 2006;Tangang et al, 2012), the Indian Ocean dipole creating cooler (warmer) conditions during positive (negative) phases and the Pacific Decadal Oscillation leading to colder (warmer) sea surface temperatures during the negative (positive) phase (Screen and Francis, 2016).…”

Section: Regional Setting and Climatementioning

confidence: 99%

Massive corals record deforestation in Malaysian Borneo through sediments in river discharge

Naciri

Boom

Payne

et al. 2023

Preprint

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Abstract. Logging of tropical primary forests is a widely acknowledged global issue threatening biodiversity hotspots and indigenous communities leading to significant land erosion and decreased soil stability. The downstream effects of logging on human coastal communities include poor water quality and increased sedimentation. Quantifying the impacts of historical deforestation within a watershed requires accurate data from river discharge or satellite images, which are rarely available prior to the 1980’s. In the absence of these in-situ measurements, proxies have successfully produced accurate, long-range, historical records of temperature, hydrological balance, and sediment discharge in coastal and oceanic environments. We present a 30 year, monthly resolved Ba/Ca proxy record of sediment in river discharge as measured from the skeletal remains of massive corals Porites sp. from northern Malaysian Borneo. We make the comparison with local instrumental hydrology data, river discharge and rainfall, to test the reliability of the Ba/Cacoral proxy. Our results show that averaging five records into two composites results in significant positive correlations with river discharge (r = 0.5 and r = 0.59) as well as a difference in correlations strength coherent with distance from the river mouth, with the composite closer to the river mouth displaying a higher correlation. More importantly, Porites sp. corals from this region recorded a very similar upward trend to that of river discharge on multi decennial time scales. The lack of similar increase, and overall stability in the precipitation record suggests that the river discharge’s trend recorded by corals is linked to the increasing land use associated with ever–growing deforestation. We argue that massive corals in this region are therefore valuable archives of past hydrological conditions and accurately reflect changes in land use patterns.

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Spatial and Temporal Variations in Rainfall and the ENSO-rainfall Relationship over Sarawak, Malaysian Borneo

Cited by 17 publications

References 11 publications

Geographical Pattern and Environmental Correlates of Regional-Scale General Flowering in Peninsular Malaysia

Geographical Pattern and Environmental Correlates of Regional-Scale General Flowering in Peninsular Malaysia

Water Quality and Aquatic Insects Study at the Lower Kinabatangan River Catchment, Sabah: In Response to Weak La Niña Event

Massive corals record deforestation in Malaysian Borneo through sediments in river discharge

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