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lohafex wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 background 2 course of the experiment 3 opposition and protests 4 prior experiments 5 results 6 references toggle the table of contents lohafex 4 languages deutsch español hausa മലയാളം edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia redirected from lohafex ocean iron fertilization experiment you can help expand this article with text translated from the corresponding article in spanish september 2015 click show for important translation instructions view a machine translated version of the spanish article machine translation like deepl or google translate is a useful starting point for translations but translators must follow the llm translation guideline revise errors as necessary and confirm that the translation is accurate rather than simply copy pasting machine translated text into the english wikipedia consider adding a topic to this template there are already 1 154 articles in the main category and specifying topic will aid in categorization do not translate text that appears unreliable or low quality if possible verify the text with references provided in the foreign language article you must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation a model attribution edit summary is content in this edit is translated from the existing spanish wikipedia article at es experimento lohafex see its history for attribution you may also add the template translated es experimento lohafex to the talk page for more guidance see wikipedia translation the polarstern the german research vessel used to conduct the lohafex experiment lohafex was an ocean iron fertilization experiment jointly planned by the council of scientific and industrial research csir in india and the helmholtz association in germany the purpose of the experiment was to see if the iron would cause an algal bloom and trap carbon dioxide from the atmosphere while an algal bloom did result it was smaller than expected and as most of the algae were consumed by zooplankton instead of sinking to the ocean floor the amount of carbon dioxide permanently removed from the atmosphere was deemed negligible the result was thus a setback for plans to use iron fertilization of the oceans to create negative carbon dioxide emissions background edit the experiment followed a memorandum of understanding signed on 30 october 2007 by dr t ramaswami director general csir and dr juergen mlynek president helmholtz foundation germany on cooperation in marine sciences during the visit of then german chancellor angela merkel to india the experiment was conducted mainly by csir national institute of oceanography india nio goa and alfred wegener institute of polar and marine research awi bremerhaven with participation of scientists from chile france spain and the united kingdom the german research vessel polarstern was utilized for the experiment on her ant xxv 3 cruise it was jointly led by wajih naqvi of csir nio and victor smetacek of awi weekly reports of the expedition were published on the website of awi 1 course of the experiment edit a cyclonic eddy centered on 48 deg s 16 deg e was selected for fertilization the experiment began on india s republic day 26 january 2009 10 tonnes 9 8 long tons 11 short tons of ferrous sulfate dissolved in seawater was spread over an area of 300 square kilometres 120 sq mi and the patch created was monitored for 38 days to investigate the effects of iron addition on marine biogeochemistry and ecosystem another iron addition of similar magnitude was done two weeks later it was expected that iron addition would trigger algal blooms leading to sequestration of carbon dioxide from the atmosphere the ship left cape town on 7 january 2009 the expedition ended after 70 days on 17 march 2009 in punta arenas chile opposition and protests edit following protests from several ngos the german government ordered a halt of the experiment environmentalists feared damage to the marine ecosystem from an artificial algal bloom the critics argued that long term effects of ocean fertilization would not be detectable during short term observation 2 other critics feared the entry into large scale manipulation of ecosystems with these large geo engineering experiments 3 4 the german government sent the proposal for scientific and legal reviews that were supportive of the project and the experiment was allowed to continue prior experiments edit lohafex was not the first experiment of its kind in 2000 and 2004 comparable amounts of iron sulfate were discharged from the same ship de eisenex experiment 10 to 20 percent of the algal bloom died off and sank to the sea floor this removed carbon from the atmosphere creating the intended carbon sink effect results edit as expected iron fertilization led to development of a bloom during lohafex but the chlorophyll increase within the fertilized patch an indicator of biomass was smaller than in previous experiments the algal bloom also stimulated the growth of zooplankton that feed on them the zooplankton in turn are consumed by higher organisms thus ocean fertilization with iron also contributes to the carbon fixing marine biomass 5 of fish species which have been removed from the ocean by over fishing 6 by increasing marine primary production large scale iron fertilization could increase marine biomass in contrast to the other experiments e g eisenex the uptake of the algae by zooplankton left no relevant organic carbon to sink to the ocean floor thus the applied iron did not contribute to the sequestration of carbon dioxide from the atmosphere 7 references edit alfred wegener institut für polar und meeresforschung awi ant xxv 3 archived from the original on 8 october 2012 retrieved 9 august 2012 lohafex über sich selbst retrieved 9 august 2012 polarsternreise zur manipulation der erde retrieved 9 august 2012 geo engineering in the southern ocean pdf retrieved 9 august 2012 the starving ocean fisherycrisis com retrieved 2014 04 23 dem klima zuliebe das meer düngen retrieved 9 august 2012 awi polarsternexpedition lohafex gibt neue einblicke in die planktonökologie wenig atmosphärisches kohlendioxid im südlichen ozean gebunden retrieved 2019 12 17 retrieved from https en wikipedia org w index php title lohafex oldid 1370548599 category climate change in germany hidden categories articles with short description short description is different from wikidata articles needing translation from spanish wikipedia this page was last edited on 21 august 2026 at 19 42 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents lohafex 4 languages add topic