2005 \u5e749 \u6708\u4e0a\u65ec\u306b\u76f8\u6a21\u6e7e\u4e2d\u592e\u90e8\u3067\u63a1\u53d6\u3057\u305f\u8868\u5c64\u6c34\uff0810 m\uff09\u3068\u6df1\u5c64\u6c34\uff08205 m\uff09\u304a\u3088\u3073\u4e21\u8005\u306e\u6df7 \u5408\u6c34\uff08\u8868\u5c64\u6c34\uff1a\u6df1\u5c64\u6c34\uff1d2 :1) \u3092\u906e\u853d\u7528\u30cd\u30c3\u30c8\u3067\u8986\u3044\u5149\u5f37\u5ea6\u306e\u7570\u306a\u308b\u5929\u7136\u5149\u4e0b\u3067\u57f9\u990a\u3057\uff0c\u6804\u990a\u5869 \u985e\uff0c\u30af\u30ed\u30ed\u30d5\u30a3\u30ebα(Chl. a)\uff0c\u7c92\u72b6\u6709\u6a5f\u70ad\u7d20\u30fb\u7a92\u7d20\uff08POC \u30fbPON\uff09\u304a\u3088\u3073\u751f\u7269\u8d77\u6e90\u30b1\u30a4\u7d20\uff08BSi) \u306e\u65e5\u5909\u5316\u3092\u8abf\u3079\uff0c\u6df1\u5c64\u6c34\u306e\u80a5\u6c83\u5316\u52b9\u679c\u3092\u691c\u8a3c\u3057\u305f\uff0e 25\uff05\u5149\u900f\u904e\u7387\u306e\u6df7\u5408\u6c34\u3067\u306f\uff0c\u57f9\u990a\u958b\u59cb4 \u65e5\u76ee \u306b\u9855\u8457\u306aChl.α\u30d4\u30fc\u30af\uff08\u6700\u5927\u5024\uff09 \u3068\u785d\u9178\u5869\u3068\u30ea\u30f3\u9178\u5869\u306e\u67af\u6e07\u3092\u793a\u3057\u305f\u304c\uff0c\u30b1\u30a4\u9178\u5869\u306f\u5b9f\u9a13\u671f\u9593\u4e2d \u306b\u67af\u6e07\u72b6\u614b\u306b\u81f3\u3089\u306a\u304b\u3063\u305f\uff0e Chl. a, POC, PON \u53ca\u3073BSi \u306e\u5897\u52a0\u91cf\u306f\u6804\u990a\u5869\u306e\u6e1b\u5c11\u91cf\u306b\u6bd4\u4f8b\u3057\uff0c\u307e \u305fChl.α\u306e\u6bd4\u5897\u52a0\u901f\u5ea6\u306f\u5149\u5f37\u5ea6\u306b\u5bfe\u3057\u3066\u5f37\u3044\u4f9d\u5b58\u6027\u3092\u793a\u3057\uff0c\u5b9f\u9a13\u958b\u59cb\u6642\u306e\u521d\u671f\u6804\u990a\u5869\u6fc3\u5ea6\u306b\u3082\u5f71 \u97ff\u3092\u53d7\u3051\u3066\u3044\u305f\uff0e \u3053\u308c\u3089\u306e\u7d50\u679c\u306f\u76f8\u6a21\u6e7e\u306b\u304a\u3051\u308b\u6d77\u6d0b\u6df1\u5c64\u6c34\u306e\u80a5\u6c83\u5316\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb\u3092\u660e\u77ad\u306b\u793a\u3057\uff0c \u80a5\u6c83\u5316\u306e\u305f\u3081\u306b\u306f\u4eba\u5de5\u63da\u6c34\u3057\u305f\u6df1\u5c64\u6c34\u3092\uff0c\u590f\u5b63\u8868\u9762\u5149\u91cf\u306e10\uff05\u7a0b\u5ea6\u4ee5\u4e0a\u306e\u6c34\u6df1\u306b\u5c11\u306a\u304f\u3068\u3082\u6570\u65e5 \u9593\u4ee5\u4e0a\u306b\u308f\u305f\u3063\u3066\u6ede\u7559\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u3068\u63a8\u5bdf\u3055\u308c\u305f\uff0e <\/p>\n
The response of the surface water phytoplankton community in Sagami Bay by the addi– tion of deep ocean water (DOW) was examined under natural sunlight in early September 2005. DOW collected from 205 m depth was mixed with surface water (SW) from 10 m in 20 liters polycarbonate bottles and incubated on deck of the R\/V Tansei Maru using a deck incubator under different attenuated natural irradiance (25%,13%and 6% attenuation for the mixed water). The DOW and the SW were also incubated at 25% and 50% attenuation, respectively. Chlorophyll a (Chl. a) increased rapidly in the mixed water under 25% attenua– tion and reached maximum concentration at 4 days later when nitrate and phosphate were depleted but silicate was not depleted until the end of the experiment. Particulate organic carbon (POC),particulate organic nitrogen (PON),and particulate biogenic silicon (BSi) also showed similar increases but did not have as conspicuous a peak within the incubation period as Chl. a. The net increase of particulate matter was well correlated with the net de-crease of nutrients and the specific growth rates of Chl. a increased with the increase of light intensity and the initial nutrient concentration. These results clearly indicate the potential fertility of DOW to phytoplankton community in Sagami Bay and for ocean fertilization the pumped-up DOW should remain at water depths shallower than 20 m (more than 10%at-tenuation of surface irradiance) for several days or more.<\/p>\n","protected":false},"excerpt":{"rendered":"
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[…]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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