Diurnal and seasonal variations of carbonate system parameters on Luhuitou fringing reef, Sanya Bay, Hainan Island, South China Sea

Chenglong, Zhang; Huang, Hui; Cheng, Yu; Huang, Liangmin; Li, Xiubao; Ji, Lian; Liu, Sheng

doi:10.1016/j.dsr2.2013.02.013

Cited by 33 publications

(27 citation statements)

References 46 publications

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“…The increase in pH concedes with the peak temperature (photosynthetic hours) for both stations. The observation of Zhang et al, (2013), which showed that the pH moved in line with the diurnal trends of temperature, falling to the lowest values at 0600 am and rising to the highest between 12:00 and 15:00, when the temperature reached the peak of the day at Sanya Bay, is comparable to the present observation. The authors attributed the pH change to the photosynthesis process of biological community.…”

Section: Phsupporting

confidence: 79%

Between River and Sea: What Control a Daily Variation of Physicochemical Properties of Estuary?

Mchenga¹,

Suratman²,

Tahir³

2017

Int.J.Curr.Res.Aca.Rev.

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Article InfoPhysico-chemical features are among important factor that contributes to the variability of the estuarine environment. This study has been conducted to assess diurnal fluctuations of some physicochemical features in relation to tides in the surface water of Terengganu river estuary. The three stations were set al.,ong the area which linked the river to the coastal water where salinity, temperature, dissolved Oxygen, pH, TSS, chlorophyll-a, Phosphate and silicate nutrients were measured at the surface water for every 2 hrs over a period of 12 hrs during spring tide of September 2012. The salinity changes were found to follow the tidal rhythm, while the daily variation of the remaining feature were found to be more pronounced than the tidal induced variation.With exception to salinity, gradual increases in all features were observed during the day tides, which generally, decreased from afternoon and early morning. The effect of tidal amplitude which said to be important in determining the extent of variation was more pronounced at lower estuary. The remaining stations were observed to be strongly influenced by the river flow.

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Section: Phsupporting

confidence: 79%

Between River and Sea: What Control a Daily Variation of Physicochemical Properties of Estuary?

Mchenga¹,

Suratman²,

Tahir³

2017

Int.J.Curr.Res.Aca.Rev.

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“…However, the limited number of available studies suggest that tropical estuaries are generally sources of CO 2 to the atmosphere (Souza et al, 2009;Sarma et al, 2012;Araujo et al, 2014), with the exception of one lagoon (Koné et al, 2009). Also, most studies are potentially biased by the lack of information on the diurnal variations in CO 2 , which corresponds to a crucial component of mass balance calculations (Borges and Frankignoulle, 1999;Zhang et al, 2013;Maher et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

A strong CO<sub>2</sub> sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

et al. 2015

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Abstract. In contrast to its small surface area, the coastal zone plays a disproportionate role in the global carbon cycle. Carbon production, transformation, emission and burial rates at the land-ocean interface are significant at the global scale but still poorly known, especially in tropical regions. Surface water pCO 2 and ancillary parameters were monitored during nine field campaigns between April 2013 and April 2014 in Guanabara Bay, a tropical eutrophic to hypertrophic semienclosed estuarine embayment surrounded by the city of Rio de Janeiro, southeast Brazil. Water pCO 2 varied between 22 and 3715 ppmv in the bay, showing spatial, diurnal and seasonal trends that mirrored those of dissolved oxygen (DO) and chlorophyll a (Chl a). Marked pCO 2 undersaturation was prevalent in the shallow, confined and thermally stratified waters of the upper bay, whereas pCO 2 oversaturation was restricted to sites close to the small river mouths and small sewage channels, which covered only 10 % of the bay's area. Substantial daily variations in pCO 2 (up to 395 ppmv between dawn and dusk) were also registered and could be integrated temporally and spatially for the establishment of net diurnal, seasonal and annual CO 2 fluxes. In contrast to other estuaries worldwide, Guanabara Bay behaved as a net sink of atmospheric CO 2 , a property enhanced by the concomitant effects of strong radiation intensity, thermal stratification, and high availability of nutrients, which promotes phytoplankton development and net autotrophy. The calculated CO 2 fluxes for Guanabara Bay ranged between −9.6 and −18.3 mol C m −2 yr −1 , of the same order of magnitude as the organic carbon burial and organic carbon inputs from the watershed. The positive and high net community production (52.1 mol C m −2 yr −1 ) confirms the high carbon production in the bay. This autotrophic metabolism is apparently enhanced by eutrophication. Our results show that global CO 2 budgetary assertions still lack information on tropical, marine-dominated estuarine systems, which are affected by thermal stratification and eutrophication and behave specifically with respect to atmospheric CO 2 .

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“…Notably, temperature profiles from reef environments typically show diel oscillations of 4-10 • C (Coles, 1997;Dandan et al, 2015;Guadayol et al, 2014;Oliver and Palumbi, 2011;Rivest and Gouhier, 2015). A consistent daily cycle is commonly present, with temperature increasing after sunrise, peaking after noon and then gradually decreasing to the minimum (e.g., Putnam and Edmunds, 2011;Zhang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Impact of diurnal temperature fluctuations on larval settlement and growth of the reef coral <i>Pocillopora damicornis</i>

et al. 2017

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Abstract. Diurnal fluctuations in seawater temperature are ubiquitous on tropical reef flats. However, the effects of such dynamic temperature variations on the early stages of corals are poorly understood. In this study, we investigated the responses of larvae and new recruits of Pocillopora damicornis to two constant temperature treatments (29 and 31 • C) and two diurnally fluctuating treatments (28-31 and 30-33 • C with daily means of 29 and 31 • C, respectively) simulating the 3 • C diel oscillations at 3 m depth on the Luhuitou fringing reef (Sanya, China). Results showed that the thermal stress on settlement at 31 • C was almost negated by the fluctuating treatment. Further, neither elevated temperature nor temperature fluctuations caused bleaching responses in recruits, while the maximum excitation pressure over photosystem II (PSII) was reduced under fluctuating temperatures. Although early growth and development were highly stimulated at 31 • C, oscillations of 3 • C had little effects on budding and lateral growth at either mean temperature. Nevertheless, daytime encounters with the maximum temperature of 33 • C in fluctuating 31 • C elicited a notable reduction in calcification compared to constant 31 • C. These results underscore the complexity of the effects caused by diel temperature fluctuations on early stages of corals and suggest that ecologically relevant temperature variability could buffer warming stress on larval settlement and dampen the positive effects of increased temperatures on coral growth.

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Diurnal and seasonal variations of carbonate system parameters on Luhuitou fringing reef, Sanya Bay, Hainan Island, South China Sea

Cited by 33 publications

References 46 publications

Between River and Sea: What Control a Daily Variation of Physicochemical Properties of Estuary?

Between River and Sea: What Control a Daily Variation of Physicochemical Properties of Estuary?

A strong CO<sub>2</sub> sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

Impact of diurnal temperature fluctuations on larval settlement and growth of the reef coral <i>Pocillopora damicornis</i>

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Diurnal and seasonal variations of carbonate system parameters on Luhuitou fringing reef, Sanya Bay, Hainan Island, South China Sea

Cited by 33 publications

References 46 publications

Between River and Sea: What Control a Daily Variation of Physicochemical Properties of Estuary?

Between River and Sea: What Control a Daily Variation of Physicochemical Properties of Estuary?

A strong CO&lt;sub&gt;2&lt;/sub&gt; sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

Impact of diurnal temperature fluctuations on larval settlement and growth of the reef coral &lt;i&gt;Pocillopora damicornis&lt;/i&gt;

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A strong CO<sub>2</sub> sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

Impact of diurnal temperature fluctuations on larval settlement and growth of the reef coral <i>Pocillopora damicornis</i>