El Niño Southern Oscillation Signature in Atmospheric Water Isotopes over Maritime Continent during Wet Season

Suwarman, Rusmawan; Ichiyanagi, Kimpei; Tanoue, Masahiro; Yoshimura, Kei; Mori, Shuichi; Yamanaka, Manabu D.; Syamsudin, Fadli; Belgaman, Halda Aditya

doi:10.2151/jmsj.2017-003

Cited by 9 publications

(6 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have confirmed that a major river in West Jawa has a diurnal cycle (Sulistyowati et al 2014). The hydrologic cycle over the IMC has been revealed using isotopic analyses of sampled rain and land water (Kurita et al 2009;Fudeyasu et al 2011;Suwarman et al 2013Suwarman et al , 2017Belgaman et al 2016;Permana et al 2016). Furthermore, we know diurnal cycles occur also in the biosphere and humanosphere, which are also concentrated near the coastline.…”

Section: Local Rainfall As a Function Of Coastal Distancementioning

confidence: 99%

“…In particular, west−east differences of the IMC have been found in climatological (e.g., Köppen 1918;Murakami and Matsumoto 1994;Kubota et al 2011;Hidayat et al 2016;Lestari et al 2016), and cloudphysical (e.g., As-syakur et al 2016) and water isotope (Suwarman et al 2013(Suwarman et al , 2017Belgaman et al 2016;Permana et al 2016) observations. The western part has relatively greater rainfall, a more continental-like raindrop size distribution, and more Indian Ocean monsoon-like origin than the eastern part.…”

Section: Regional Rainfall As a Function Of "Coastline Density"mentioning

confidence: 99%

See 1 more Smart Citation

Maritime continent coastlines controlling Earth’s climate

Yamanaka

Ogino

et al. 2018

Prog Earth Planet Sci

Self Cite

View full text Add to dashboard Cite

During the Monsoon Asian Hydro−Atmosphere Scientific Research and Prediction Initiative (MAHASRI; 2006-16), we carried out two projects over the Indonesian maritime continent (IMC), constructing the Hydrometeorological Array for Intraseasonal Variation−Monsoon Automonitoring (HARIMAU; 2005-10) radar network and setting up a prototype institute for climate studies, the Maritime Continent Center of Excellence (MCCOE; 2009-14). Here, we review the climatological features of the world's largest "regional" rainfall over the IMC studied in these projects. The fundamental mode of atmospheric variability over the IMC is the diurnal cycle generated along coastlines by land−sea temperature contrast: afternoon land becomes hotter than sea by clear-sky insolation before noon, with the opposite contrast before sunrise caused by evening rainfall-induced "sprinkler"-like land cooling (different from the extratropical infrared cooling on clear nights). Thus, unlike the extratropics, the diurnal cycle over the IMC is more important in the rainy season. The intraseasonal, seasonal to annual, and interannual climate variabilities appear as amplitude modulations of the diurnal cycle. For example, in Jawa and Bali the rainy season is the southern hemispheric summer, because land heating in the clear morning and water vapor transport by afternoon sea breeze is strongest in the season of maximum insolation. During El Niño, cooler sea water surrounding the IMC makes morning maritime convection and rainfall weaker than normal. Because the diurnal cycle is almost the only mechanism generating convective clouds systematically near the equator with little cyclone activity, the local annual rainfall amount in the tropics is a steeply decreasing function of coastal distance (e-folding scale 100-300 km), and regional annual rainfall is an increasing function of "coastline density" (coastal length/land area) measured at a horizontal resolution of 100 km. The coastline density effect explains why rainfall and latent heating over the IMC are twice the global mean for an area that makes up only 4% of the Earth's surface. The diurnal cycles appearing almost synchronously over the whole IMC generate teleconnections between the IMC convection and the global climate. Thus, high-resolution (<< 100 km; << 1 day) observations and models over the IMC are essential to improve both local disaster prevention and global climate prediction.

show abstract

Section: Local Rainfall As a Function Of Coastal Distancementioning

confidence: 99%

Section: Regional Rainfall As a Function Of "Coastline Density"mentioning

confidence: 99%

Maritime continent coastlines controlling Earth’s climate

Yamanaka

Ogino

et al. 2018

Prog Earth Planet Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…As shown in Fig. 1b, the MC rainfall significantly varies over the two seasons (wet and dry), which is characterized by an annual cycle of typical wetness (one standard deviation larger than annual climatology) in winter and typical dryness (one standard deviation smaller than annual climatology) in summer, as in King and Vincent (2018) and Suwarman et al (2017). For comparison, Fig.…”

Section: B Definition Of the MC Wet Seasonmentioning

confidence: 95%

Decadal variation of the rainfall predictability over the maritime continent in the wet season

Tang

Song

et al. 2022

Journal of Climate

View full text Add to dashboard Cite

Maritime continent (MC) rainfall plays an important role in global climate variability, but its prediction remains extremely challenging. Based on a long-term state-of-the-art hindcast product recently completed by the authors’ group, this work investigates the decadal variation of the MC rainfall predictability in the wet season for the first time. The prediction skills were relatively high before 1940 and after 1980, but relatively low between these years. In a diagnostic analysis of the controlling factors of the decadal variation, the signal strength represented by the variance of the rainfall variability was identified as the dominant factor. Further analysis concluded that the El Niño Southern Oscillation (ENSO) phases are the key controlling sources. The MC rainfall was more predictable during periods dominated by El Niño events than during periods dominated by La Niña events because El Niño elicits stronger ocean–atmosphere interactions in the tropics, providing a stronger signal of MC rainfall than La Niña events.

show abstract

“…5c). This is a region where ENSO-related large-scale atmospheric circulation changes produce a clear amount effect (Suwarman et al 2017;Kurita et al 2009;Conroy et al 2013a). Additionally, a stronger PWC is associated with a southward shift of the southern margin of the Intertropical Convergence Zone over the maritime continent (Freitas et al 2017), which increases precipitation over northern Australia and decreases δ 18 OP via an amount effect, and also increases the incidence of tropical cyclones, which typically have lower δ 18 OP than non-cyclonic rainfall (Hollins et al 2018;Haig et al 2014;Gedzelman et al 2003;Lawrence and Gedzelman 1996).…”

Section: Proposed Mechanisms For the Pwc Imprint In Global δ 18 Opmentioning

confidence: 99%

Imprint of the Pacific Walker Circulation in global precipitation δ18O

Falster¹,

Konecky²,

Midhun³

et al. 2022

Preprint

View full text Add to dashboard Cite

Characterising variability in the global water cycle is fundamental to predicting impacts of future climate change; understanding the role of the Pacific Walker circulation (PWC) in the regional expression of global water cycle changes is critical to understanding this variability. Water isotopes are ideal tracers of the role of the PWC in global water cycling, because they retain information about circulation-dependent processes including moisture source, transport, and delivery. We collated publicly-available measurements of precipitation δ18O (δ18OP), and used novel data processing techniques to synthesise long (34-year), globally-distributed composite records from temporally discontinuous δ18OP measurements. We investigated relationships between global-scale δ18OP variability and PWC strength, as well as other possible drivers of global δ18OP variability—including the El Niño Southern Oscillation (ENSO) and global mean temperature—and used isotope-enabled climate model simulations to assess potential biases arising from uneven geographical distribution of the observations or our data processing methodology. Co-variability underlying the δ18OP composites is more strongly correlated with the PWC (r = 0.74) than any other index of climate variability tested. We propose that the PWC imprint in global δ18OP arises from multiple complementary processes, including PWC-related changes in moisture source and transport length, and a PWC- or ENSO-driven ‘amount effect’ in tropical regions. The clear PWC imprint in global δ18OP implies a strong PWC influence on the regional expression of global water cycle variability on interannual to decadal timescales, and hence that uncertainty in the future state of the PWC translates to uncertainties in future changes in the global water cycle.

show abstract

El Niño Southern Oscillation Signature in Atmospheric Water Isotopes over Maritime Continent during Wet Season

Cited by 9 publications

References 50 publications

Maritime continent coastlines controlling Earth’s climate

Maritime continent coastlines controlling Earth’s climate

Decadal variation of the rainfall predictability over the maritime continent in the wet season

Imprint of the Pacific Walker Circulation in global precipitation δ18O

Contact Info

Product

Resources

About