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Poster Session 1<\/a>, Monday,\u00a0 October\u00a0 3, 15:40\u201318:00<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Extended abstracts” _builder_version=”4.18.0″ link_font=”||||on||||” header_3_font=”|800||on|||||” header_3_text_color=”#057184″ header_3_font_size=”20px” header_3_line_height=”1.2em” header_5_font=”|||on|||||” header_5_text_color=”#545454″ header_5_font_size=”17px” background_size=”initial” background_position=”top_left” background_repeat=”repeat” custom_margin=”7px||15px|||” hover_enabled=”0″ use_border_color=”off” global_colors_info=”{}” link_text_color__hover=”#a5a5a5″ link_text_color__hover_enabled=”on|hover” theme_builder_area=”post_content” sticky_enabled=”0″]<\/p>\n [\/et_pb_text][et_pb_text admin_label=”Extended abstracts” _builder_version=”4.18.0″ link_font=”||||on||||” header_3_font=”|800||on|||||” header_3_text_color=”#057184″ header_3_font_size=”20px” header_3_line_height=”1.2em” header_5_font=”|||on|||||” header_5_font_size=”17px” background_size=”initial” background_position=”top_left” background_repeat=”repeat” custom_margin=”7px|||||” hover_enabled=”0″ use_border_color=”off” global_colors_info=”{}” link_text_color__hover=”#a5a5a5″ link_text_color__hover_enabled=”on|hover” theme_builder_area=”post_content” sticky_enabled=”0″]<\/p>\n Phytoplankton pigment absorption (aph) is an important parameter in models for remote sensing retrieval of chlorophyll a (Chl_a), which is still a challenge in turbid inland and coastal waters. Absorption parameters (aph, absorption of non-algal particles (anap) and absorption of coloured dissolved organic matter (aCDOM)) were studied three times over the vegetation period of three years (2018-2020) from various Estonian lakes (30 altogether). From the implementation of Water Framework Directive (WFD) in 2002 Estonian lakes are divided into 8 types according to their surface area, alkalinity, colour, depth, and salinity. This study focused on lakes from WFD types II-VII. Transparency in lakes was between 0.1-7 m (average 2.07) and the amount of in-water substances varied: Chl_a concentration ranged from 1.6 to 105.7 mg\/m 3 (average 16.4); the amount of suspended matter was from 0.8 to 143.3 g\/m 3 (average 5.63). Absorption parameters varied: aCDOM_443 was between 0.5-47.3 m -1 (average 5.7) and aph_443 was 0.02-3.5 m -1 (average 0.2). CDOM was the main absorber, and in dark-water lakes (WFD_Type_III) CDOM absorption accounted for more than 94%. The highest average contribution by anap (15%) was found in shallow, well-mixed lakes (WFD_type_II). The use of derived conversion factors from aph_443 to Chl_a allowed enhanced retrieval of Chl_a from Sentinel3\/OLCI data. However, Chl_a was more accurately detected from a ph at wavelengths around 670, leading to higher correlation coefficient in comparison to a ph at 443 nm, thus aph_670 should be preferred for Chl_a detection from hyperspectral sensors in turbid waters.<\/p>\n Kersti Kangro<\/b><\/a><\/span>, University of Tartu, kiti@ut.ee, 0000-0001-6143-9330\u00a0<\/span><\/p>\n Krista Alikas, University of Tartu, krista.alikas@gmail.com\u00a0<\/span><\/p>\n Martin Ligi, University of Tartu, martin.ligi@ut.ee\u00a0<\/span><\/p>\n Ilmar Ansko, University of Tartu, jazov@to.ee<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ custom_padding_last_edited=”on|tablet” _builder_version=”4.14.7″ _module_preset=”default” background_enable_color=”off” background_image=”https:\/\/oceanopticsconference.org\/wp-content\/uploads\/2022\/01\/oo22-banner-bckd.jpg” custom_padding=”0px||11px||false|false” custom_padding_tablet=”0px||11px||false|false” custom_padding_phone=”||27px||false|false” global_module=”2766″ saved_tabs=”all” locked=”off” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_row _builder_version=”4.16″ _module_preset=”default” custom_padding=”0px||8px||false|false” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_social_media_follow use_icon_font_size=”on” icon_font_size=”19px” _builder_version=”4.16″ _module_preset=”default” custom_button=”on” text_orientation=”right” custom_margin=”-10px||11px||false|false” custom_margin_tablet=”-9px||5px||false|false” custom_margin_phone=”-9px||5px||false|false” custom_margin_last_edited=”on|tablet” global_colors_info=”{}” button_text_size__hover_enabled=”on|desktop” theme_builder_area=”post_content”][et_pb_social_media_follow_network social_network=”facebook” url=”https:\/\/www.facebook.com\/OceanOpticsConference\/” _builder_version=”4.16″ _module_preset=”default” background_color=”#9b9b9b” background_enable_color=”on” global_colors_info=”{}” background__hover_enabled=”on|hover” background_color__hover=”#0C71C3″ background_enable_color__hover=”on” theme_builder_area=”post_content” follow_button=”off” url_new_window=”on”]facebook[\/et_pb_social_media_follow_network][et_pb_social_media_follow_network social_network=”twitter” url=”https:\/\/twitter.com\/OceanOpticsConf” _builder_version=”4.16″ _module_preset=”default” background_color=”#9b9b9b” background_enable_color=”on” global_colors_info=”{}” background__hover_enabled=”on|hover” background_color__hover=”#0C71C3″ background_enable_color__hover=”on” theme_builder_area=”post_content” follow_button=”off” url_new_window=”on”]twitter[\/et_pb_social_media_follow_network][\/et_pb_social_media_follow][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ use_custom_gutter=”on” gutter_width=”2″ _builder_version=”4.16″ _module_preset=”default” custom_padding=”13px||34px|0px||” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”1_3″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_text _builder_version=”4.16″ _module_preset=”default” header_font_size=”26px” header_2_font=”|||on|||||” header_2_text_align=”center” header_2_text_color=”#FFFFFF” header_2_font_size=”21px” text_orientation=”center” custom_margin=”||5px|||” global_colors_info=”{}” theme_builder_area=”post_content”]<\/p>\n [\/et_pb_text][et_pb_text _builder_version=”4.16″ _module_preset=”default” text_text_color=”#FFFFFF” link_font=”||||on||||” link_text_color=”#FFFFFF” header_2_text_color=”#FFFFFF” max_width=”300px” module_alignment=”center” custom_margin=”||||false|false” custom_margin_tablet=”||-3px||false|false” custom_margin_phone=”” custom_margin_last_edited=”on|tablet” custom_padding_tablet=”||||false|false” custom_padding_phone=”||32px||false|false” custom_padding_last_edited=”on|phone” global_colors_info=”{}” link_text_color__hover_enabled=”on|hover” link_text_color__hover=”#a8a8a8″ theme_builder_area=”post_content”]<\/p>\n Sign up to receive email updates to be sure to catch all the meeting news. 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Absorption parameters (aph, absorption of non-algal particles (anap) and […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":""},"_links":{"self":[{"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/pages\/6604"}],"collection":[{"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/comments?post=6604"}],"version-history":[{"count":2,"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/pages\/6604\/revisions"}],"predecessor-version":[{"id":6612,"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/pages\/6604\/revisions\/6612"}],"wp:attachment":[{"href":"https:\/\/oceanopticsconference.org\/wp-json\/wp\/v2\/media?parent=6604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Poster 49<\/h5>\n
Chlorophyll a detection from absorption measurements for various lake types<\/h3>\n
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