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Related Concept Videos

Other Algae01:19

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
Marine Microbial Ecology01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
Overview of Algae01:28

Overview of Algae

The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
Red Algae01:23

Red Algae

Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...

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Published on: August 14, 2020

HONO emission from marine algae.

Hengqing Shen1,2, Xuelian Zhong1, Yujiao Zhu1

  • 1Environment Research Institute, Shandong University, Qingdao 266237, China.

Science Advances
|May 6, 2026
PubMed
Summary
This summary is machine-generated.

Marine algae photodecomposition is a new source of nitrous acid (HONO). This process, driven by sunlight and algal surface area, significantly impacts atmospheric chemistry and pollutant levels.

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Area of Science:

  • Atmospheric Chemistry
  • Marine Ecology
  • Biogeochemical Cycles

Background:

  • Nitrous acid (HONO) is a crucial atmospheric precursor to hydroxyl radicals (OH) and a reservoir for reactive nitrogen.
  • Marine environments are increasingly impacted by algal blooms due to eutrophication and climate change.

Purpose of the Study:

  • To identify and characterize a previously unrecognized source of nitrous acid (HONO) in marine environments.
  • To quantify the contribution of marine algae photodecomposition to atmospheric HONO levels.

Main Methods:

  • Field observations of HONO during marine algal blooms (Ulva prolifera).
  • Laboratory chamber experiments simulating algal irradiation and measuring HONO fluxes.
  • Incorporation of new HONO source into atmospheric chemical models.

Main Results:

  • Daytime HONO levels in marine environments correlated with tidal cycles, peaking at low tide.
  • Irradiation of common marine algae (Ulva prolifera, Sargassum) resulted in significant HONO emission.
  • Measured HONO fluxes were comparable to soil emissions and significantly higher than marine NO fluxes.
  • Atmospheric models showed substantially elevated HONO concentrations, enhancing OH and ozone production.

Conclusions:

  • Abiotic photodecomposition of marine algae represents a significant, previously unrecognized source of atmospheric HONO.
  • This algal-derived HONO impacts atmospheric oxidation capacity and pollutant levels.
  • The importance of this source is expected to grow with increasing global algal blooms.