Optical, biological, and chemical properties ofAoshio, hypoxic milky blue-green water, observed at the head of Tokyo Bay

Takeda, Shigenobu; Nimura, Yoshihachiro; Hirano, Reijiro

doi:10.1007/bf02301062

Cited by 12 publications

(19 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A strong optical signal centered near 550 nm has been attributed to a combination of colloidal elemental sulfur and manganese-rich particles that accumulate after oxidation of upwelled waters (Takeda et al 1991). Lake Rogoznica, a eutrophic, meromictic coastal salt lake in Croatia, experienced an overturn event in 1997 when the halocline that is usually present (Ciglenečki et al 1996(Ciglenečki et al , 2005 disappeared.…”

Section: Similar Events In Other Localesmentioning

confidence: 99%

Sulfide irruptions and gypsum blooms in the Salton Sea as detected by satellite imagery, 1979–2006

Tiffany

Ustin

Hurlbert

2007

Lake and Reservoir Management

View full text Add to dashboard Cite

Bright pale-green surface waters, locally called "green tides," are visible to the naked eye and satellite sensors in patches at the Salton Sea, usually between May and November. These were studied using satellite remote sensing and by direct sampling. Algal blooms are ruled out as a cause as phytoplankton abundance, and chlorophyll concentrations were lower within the patches than in surrounding areas. The presence of abundant microscopic gypsum (CaSO 4 ·2H 2 O) crystals in surface waters suggests that scattering from this precipitating salt produces the intense signals. Biogeochemical factors include: the decomposition of organic matter, resultant anoxia and production of hydrogen sulfide by sulfate-reducing bacteria at depth, and oxidation back to sulfate and precipitation of gypsum during wind-induced overturn events. Sulfide concentrations following one such event in September 2005 ranged from 0.3 to 2.7 mg l -1 at the surface and 1.2 to 25 mg l -1 in bottom waters. Gypsum crystals occurred at densities up to 40,000 ml -1 in surface water on that date, most 20-30 µm in length with some as long as 190 µm. From 1998 to 2006, gypsum blooms appear to have increased in intensity and duration implying an increase in sulfide irruptions and anoxia in surface waters. As much as 97 percent of the lake was affected in early summer of 2003 and 75-80 percent in summers of 2005 and 2006. Events lasted for months at a time during these years. This intensification is likely due to the decline in abundance of a planktivorous fish, a hybrid tilapia, the California Mozambique mouthbrooder, leading to increased algal productivity, more severe anoxia and higher levels of dissolved hydrogen sulfide. Gypsum blooms seem to have occurred at least as far back as the 1970s, and are associated with frequent mass mortalities of fish, plankton and benthos.

show abstract

Section: Similar Events In Other Localesmentioning

confidence: 99%

Sulfide irruptions and gypsum blooms in the Salton Sea as detected by satellite imagery, 1979–2006

Tiffany

Ustin

Hurlbert

2007

Lake and Reservoir Management

View full text Add to dashboard Cite

show abstract

“…Aquat Microb Ecol 60: [97][98][99][100][101][102][103][104][105][106][107][108] 2010 or polysulfides allow for visualization of these events from the surface (Takeda et al 1991, Fallesen et al 2000 and from satellite observation (Weeks et al 2004, Tiffany et al 2007c, Lavik et al 2009). While affected coastal ocean regions may be larger in extent, enclosed environments such as bays, fjords, and lakes are easier to sample and monitor, and make excellent candidates for studying the effects of water quality deterioration on food webs.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

Periodic sulfide irruptions impact microbial community structure and diversity in the water column of a hypersaline lake

Swan¹,

Reifel²,

Valentine

2010

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

The occurrence of hypoxia/anoxia and sulfide formation in productive lakes, enclosed seas, and the coastal ocean often results in catastrophic loss of plankton, benthic invertebrates, and fish populations. Sulfide formed in deeper waters is mixed upward due to storm events or currents, thereby removing oxygen from large portions of the water column. Although the deleterious effects of these events on many organisms are known, the effects on microbial communities have received less attention. Archaeal and bacterial community structure and diversity were investigated at 6 stations along 2 intersecting transects passing through a sulfide-rich plume formed in the moderately hypersaline Salton Sea, California, USA. Community structure analysis clearly distinguished samples within and outside the sulfide plume, and multivariate analyses found these patterns to be correlated with sulfide concentration. Cloning and sequencing of 16S rRNA genes revealed that Actinobacteria, Gammaproteobacteria (purple sulfur bacteria), and Chlorobi (green sulfur bacteria) were more prevalent at stations with higher sulfide concentration, and Synechococcus spp. was the most abundant bacterial lineage at most stations. Archaeal diversity was low, and sequences were affiliated with Methanohalophilus spp., Methanococcoides spp., Methanosarcinales spp., many of which are related to known methylotrophs, and Marine Benthic Group (MBG)-D sequences. Compositional differences detected between stations may reflect differential tolerances or utilization of sulfide and other reduced-sulfur compounds by the planktonic microbial community.KEY WORDS: Microbial diversity · Sulfide oxidation · Methylotrophy · Dimethylsulfide · Dimethylsulfoniopropionate · Gypsum precipitation · Water column anoxia · Hypersaline lake Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 60: [97][98][99][100][101][102][103][104][105][106][107][108] 2010 or polysulfides allow for visualization of these events from the surface (Takeda et al. 1991, Fallesen et al. 2000 and from satellite observation (Weeks et al. 2004, Tiffany et al. 2007c, Lavik et al. 2009). While affected coastal ocean regions may be larger in extent, enclosed environments such as bays, fjords, and lakes are easier to sample and monitor, and make excellent candidates for studying the effects of water quality deterioration on food webs.The Salton Sea is a large (980 km 2 ), shallow (8 m average depth), eutrophic, moderately hypersaline (48 to 50 g l -1) lake located in the southern California desert, USA (see Fig. 1). During a reconnaissance study from 1997 to 1999, the seasonal formation of anoxia and sulfide in bottom waters after thermal stratification developed was documented (Watts et al. 2001). Periodic wind storms mix oxygen-depleted, sulfide-rich bottom waters to the surface, causing mass mortality of plankton (Tiffany et al. , 2007a, benthic invertebrates (Detwiler et al. 2002), and fish (Riedel et al. 2002), as well as the precipitation of gyps...

show abstract

“…1 Outbreaks of aoshio are observed off Funabashi-Makuhari area in the head of Tokyo Bay from June to September. In Tokyo Bay, occurrences of aoshio have been recorded since the 1950s.…”

Section: Introductionmentioning

confidence: 99%

“…Mass mortality of fish and benthic animals accompanies the occurrence of aoshio because it is hypoxic. 1,5 Occurrences of transparent, sulfur smelling water and mass mortality of fish after apparent up-welling of anoxic bottom water driven by the wind are observed in several coastal areas. These characteristics of the water are attributed to its origin.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancement of sulfide auto-oxidation by metal ion in artificial seawater and a seawater which is a possible source of aoshio

2001

Self Cite

View full text Add to dashboard Cite

SUMMARY: Aoshio is hypoxic milky blue‐green seawater observed in some eutrophic bays. Previous studies have shown that colloidal sulfur causes the coloration and that the source of aoshio water is attributed to coastal anoxic bottom water. Occurrences of aoshio have been reported in limited areas of coastal seawater, although hypoxic transparent water seems rather universal. Promotion in auto‐oxidation of sulfide by metal ions in seawater was investigated to explain the occurrences of aoshio. Artificial seawater containing 10 μM metal ion was assayed for the sulfide oxidation rate. The velocity constant which represents the oxidation rate within the initial 30 min and the amount of reacted sulfide in 2 h were determined by oxygen monitoring and sulfide quantification, respectively. Fe2+ and Cu2+ enhanced the initial 30 min reaction. Fe2+, Fe3+ and Ni2+ increased the amount of reacted sulfide in 2 h, forming whitish turbid water. Seawater from a suspected source of aoshio water was also assayed for the auto‐oxidation rate of sulfide. The oxidation rate in water from 12 m depth was 13–19 times higher than the artificial seawater without an addition of heavy metal ions. More than 15% of the oxidation rate in 12 m deep seawater was explained by dissolved iron in the seawater.

show abstract

Optical, biological, and chemical properties ofAoshio, hypoxic milky blue-green water, observed at the head of Tokyo Bay

Cited by 12 publications

References 15 publications

Sulfide irruptions and gypsum blooms in the Salton Sea as detected by satellite imagery, 1979–2006

Sulfide irruptions and gypsum blooms in the Salton Sea as detected by satellite imagery, 1979–2006

Periodic sulfide irruptions impact microbial community structure and diversity in the water column of a hypersaline lake

Enhancement of sulfide auto-oxidation by metal ion in artificial seawater and a seawater which is a possible source of aoshio

Contact Info

Product

Resources

About