Rapid Alkalization in Lake Inawashiro, Fukushima, Japan: Implications for Future Changes in the Carbonate System of Terrestrial Waters

Manaka, Takuya; Ushie, Hiroyuki; Araoka, Daisuke; Inamura, Akihiko; Suzuki, Atsushi; Kawahata, Hodaka

doi:10.1007/s10498-013-9195-6

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…Cai et al (2011) reported that large riverine inputs of nutrients, as well as OM and dissolved CO 2 , can enhance the acidification of subsurface coastal waters. In contrast, this eutrophication can enhance photosynthesis, and thus CO 2 uptake, in enclosed conditions such as lakes, which may be important to the carbon cycle, particularly in developing countries (Manaka et al 2013). Therefore, changes in water composition in response to environmental change should be borne in mind in the future.…”

Section: Long-term Neutralizing Process Against Enhanced Pcomentioning

confidence: 99%

Perspective on the response of marine calcifiers to global warming and ocean acidification—Behavior of corals and foraminifera in a high CO2 world “hot house”

Kawahata

Fujita

Iguchi

et al. 2019

Prog Earth Planet Sci

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The CO 2 concentration of air has increased over the last two centuries and recently surpassed 400 ppm. Carbon cycle models project CO 2 concentrations of 720 to 1000 ppm for the IPCC intermediate scenario (RCP 6.0), resulting in an increase in global mean temperature of~2.6°C and a decrease in seawater pH of~0.3. Together, global warming and ocean acidification are often referred to as the "evil twins" of climate change, potentially inducing severe threats in the near future. In this paper, our discussion is focused on the response of two major calcifiers, foraminifera and corals, which contribute much to the global carbonate burial rate. Photosymbiosis is regarded as an adaptive ecology for living in warm and oligotrophic oceans, especially for reef-building corals and larger reefdwelling benthic foraminifera. As a consequence of global warming, bleaching may be a global threat to algal symbiont-bearing marine calcifying organisms under conditions of high temperature and light intensity. If CO 2 is dissolved in seawater, the partial pressure of CO 2 in seawater (pCO 2) and dissolved inorganic carbon (DIC) increases while pH and the saturation state of carbonate minerals decreases without any change in total alkalinity. Generally, marine calcifying organisms show decreases in calcification rates in response to acidified seawater. However, the response often differs depending on situations, species, and life-cycle stage. Some benthic foraminifera showed a positive response to low pH conditions. The Acropora digitifera coral calcification of adult branches was not reduced markedly at higher pCO 2 conditions, although calcification tended to decrease versus pCO 2 in both aposymbiotic and symbiotic polyps. New analytical technologies help identify important constraints on calcification processes. Based upon Ca isotopes, the transport path of Ca 2+ and the degree of its activity would predominantly control the carbonate precipitation rate. Visualization of the extracellular pH distribution shows that proton pumping produces the high internal pH and large internal-external pH gap in association with foraminiferal calcification. From the perspective of a long-term change in the Earth's surface environment, foraminifera seem to be more adaptive and robust than corals in coping with ocean warming and acidification but it is necessary to further understand the mechanisms underlying variations in sensitivity to heat stress and acidified seawater for future prediction. Since CO 2 is more soluble in lower temperature seawater, ocean acidification is more critical in the polar and high-latitude

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Section: Long-term Neutralizing Process Against Enhanced Pcomentioning

confidence: 99%

Perspective on the response of marine calcifiers to global warming and ocean acidification—Behavior of corals and foraminifera in a high CO2 world “hot house”

Kawahata

Fujita

Iguchi

et al. 2019

Prog Earth Planet Sci

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“…3C and 4C). In opposition the higher measurements can be explained by the dissolved CO 2 -depletion resulting from photosynthesis made by phytoplankton (Verspagen et al, 2014), to which blooms are a major driver, and the effects of such an alkalinization process are common in eutrophic fresh water bodies (Manaka et al, 2013). A study made in Furnas lake, where cyanobacteria is nowadays dominant, shows that from 2000 to 2009, 30 blooms were registered detected, 13 of which were dominated by Microcystis aeruginosa, 11 by Woronichinia naegeliana and the remaining by Microcystis spp., Anabaena spp., Aphanocapsa spp.…”

Section: Data Presentationmentioning

confidence: 99%

Sete Cidades and Furnas lake eutrophication (São Miguel, Azores): Analysis of long-term monitoring data and remediation measures

Cruz

Pacheco²,

Porteiro

et al. 2015

Science of The Total Environment

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“…It is the largest volcanogenic lake in Japan. The freshwater lake was defined as inorganic acid trophic, and it had a pH of ca 5 from at least 1933 until about 1995, when the acidity began to be buffered by agricultural runoff and industrial effluent (Yamamura, , ; Yoshimura, 1937a; Manaka et al ., ; Fukushima Prefectural Environmental Center, ). Now it has a nearly neutral pH.…”

Section: Settingmentioning

confidence: 99%

From sink to volcanic source: Unravelling missing terrestrial eruption records by characterization and high‐resolution chronology of lacustrine volcanic density flow deposits, Lake Inawashiro‐ko, Fukushima, Japan

Kataoka

Nagahashi

2019

Sedimentology

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Eruption records in the terrestrial stratigraphy are often incomplete due to erosion after tephra deposition, limited exposure and lack of precise dating owing to discontinuity of strata. A lake system and sequence adjacent to active volcanoes can record various volcanic events such as explosive eruptions and subaqueous density flows being extensions of eruption triggered and secondary triggered lahars. A lacustrine environment can constrain precise ages of such events because of constant and continuous background sedimentation. A total of 71 subaqueous density flow deposits in a 28 m long core from Lake Inawashiro-ko reveals missing terrestrial volcanic activity at Adatara and Bandai volcanoes during the past 50 kyr. Sedimentary facies, colour, grain size, petrography, clay mineralogy, micro X-ray fluorescence analysis and chemistry of included glass shards characterize the flow event deposits and clarify their origin: (i) clay-rich grey hyperpycnites, extended from subaerial cohesive lahars at Adatara volcano, with sulphide/sulphate minerals and high sulphur content which point to a source from hydrothermally altered material ejected by phreatic eruptions; and (ii) clay-rich brown density flow deposits, induced by magmatic hydrothermal eruptions and associated edifice collapse at Bandai volcano, with the common presence of fresh juvenile glass shards and low-grade hydrothermally altered minerals; whereas (iii) non-volcanic turbidites are limited to the oldest large slope failure and the 2011 Tohoku-oki earthquake events. The high-resolution chronology of volcanic activity during the last 50 kyr expressed by lacustrine event deposits shows that phreatic eruption frequency at Adatara has roughly tripled and explosive eruptions at Bandai have increased by ca 50%. These results challenge hikers, ski-fields and downstream communities to re-evaluate the increased volcanic risks from more frequent eruptions and far-reaching lahars, and demonstrate the utility of lahar and lacustrine volcanic density flow deposits to unravel missing terrestrial eruption records, otherwise the recurrence rate may be underestimated at many volcanoes.

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Rapid Alkalization in Lake Inawashiro, Fukushima, Japan: Implications for Future Changes in the Carbonate System of Terrestrial Waters

Cited by 10 publications

References 36 publications

Perspective on the response of marine calcifiers to global warming and ocean acidification—Behavior of corals and foraminifera in a high CO2 world “hot house”

Perspective on the response of marine calcifiers to global warming and ocean acidification—Behavior of corals and foraminifera in a high CO2 world “hot house”

Sete Cidades and Furnas lake eutrophication (São Miguel, Azores): Analysis of long-term monitoring data and remediation measures

From sink to volcanic source: Unravelling missing terrestrial eruption records by characterization and high‐resolution chronology of lacustrine volcanic density flow deposits, Lake Inawashiro‐ko, Fukushima, Japan

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