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The transfer of particles or molecules, such as CO2, between the atmosphere and the ocean involves a more complex mechanism. This process is associated with the formation of a liquid film saturated with particles or molecules, which regulates the movement of new particles to or from the interior of the ocean.

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Iframe

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Description

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To study the transfer of CO2 at the ocean surface, it is necessary to carefully observe the concentration changes in both the air and the water.

In the air, CO2 enters the water, creating a zone of low concentration where it decreases from $C_a$ to $C_{a,0}$. This layer has a thickness ranging from 0.1 to 1 mm.

The CO2 that enters the water initially accumulates at the surface, creating a concentration $C_{w,0}$, which then diffuses into the interior, reaching a lower concentration of $C_w$.

The concentration reduction allows us to define two zones: a very thin one, ranging from 0.02 to 0.2 mm, where the concentration decreases rapidly, and a second zone, spanning from 0.6 to 2 mm, where the concentration decreases more gradually until it reaches the concentration within the water.

Ocean-Atmosphere Interactions of Gases and Particles, Peter S. Liss, Martin T. Johnson (eds.), Springer-Verlag Berlin Heidelberg

ID:(12244, 0)

Concept

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The gas transfer rate in water ($k_w$) can be modeled using measured data. Firstly, it depends on the rate at which the system removes carbon from the air-water interface, making the transport speed proportional to the relative velocity between the two mediums.

Secondly, there is an effect of ion mobility, which can be described by the schmidt number ($Sc$), representing the relationship between momentum diffusion and particles. However, this dependence is not linear and is influenced by a factor exponente de Schmidt ($n$) that varies between -1/2 and -2/3 depending on the surface roughness.

Finally, the gas transfer rate in water ($k_w$) also depends on the factor beta del transporte aire a agua de CO2 ($\beta$), which in turn is determined by the level of surface roughness.

In summary, the gas the gas transfer rate in water ($k_w$) is described as a function of the velocidad del agua ($u_w$), the velocidad del aire ($u_a$), the schmidt number ($Sc$), the factor beta del transporte aire a agua de CO2 ($\beta$), and exponente de Schmidt ($n$) as follows:

ID:(15652, 0)

Concept

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The mobility of molecules, represented by the gas solubility ($\alpha$), is modeled as a function of particle concentration, characterized by the schmidt number ($Sc$), which in turn is calculated from parameters the viscosidad en masa acuosa ($\eta$), the densidad en capa de masa acuosa ($\rho$), and the constante de difusión en masa acuosa ($D$) using the following expression:

This relationship is visualized in the following diagram:

Ocean-Atmosphere Interactions of Gases and Particles, Peter S. Liss, Martin T. Johnson (eds.), Springer-Verlag Berlin Heidelberg

ID:(12245, 0)

Concept

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The gas transfer rate in air ($k_a$) can be estimated from Fick's law by comparing the constante de difusión en masa acuosa ($D$) with the grosor de la capa superficial ($\delta_c$) as follows:

ID:(15653, 0)

Concept

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For the interaction between the atmosphere and the ocean, the air to water transfer resistance of a gas ($R_{ta}$) initially encompasses the transfer resistance in water ($R_w$), followed by the evaporation process $1/\alpha$ with the gas solubility ($\alpha$), and once the gas has passed into the air, the transfer resistance in air ($R_a$) acts upon it:

Meanwhile, in the interaction between the atmosphere and the ocean, the water to air transfer resistance of a gas ($R_{tw}$) initially includes the transfer resistance in air ($R_a$), followed by the gas solubility ($\alpha$), and once the gas has penetrated the water, the transfer resistance in water ($R_w$) comes into play:

With these equations, we can formulate the relationships for the transfer velocities.

Therefore, using the total transfer rate of gas in air ($k_{ta}$), the gas transfer rate in water ($k_w$), the gas transfer rate in air ($k_a$), and the gas solubility ($\alpha$), we establish the following relationship:

On the other hand, with the total transfer rate of gas in water ($k_{tw}$), the gas transfer rate in water ($k_w$), the gas transfer rate in air ($k_a$), and the gas solubility ($\alpha$), we establish that:

ID:(15654, 0)

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Parameters

$D$

D

Constante de difusión en masa acuosa

m/s^2

$n$

n

Exponente de Schmidt

-

$\beta$

beta

Factor beta del transporte aire a agua de CO2

-

$\alpha$

alpha

Gas solubility

-

$k_a$

k_a

Gas transfer rate in air

m/s

$\delta_c$

delta_c

Grosor de la capa superficial

m

$Sc$

Sc

Schmidt number

-

$u_w$

u_w

Velocidad del agua

m/s

$u_a$

u_a

Velocidad del aire

m/s

Variables

$R_{ta}$

R_ta

Air to water transfer resistance of a gas

s/m

$C_a$

C_a

Gas concentration in the atmosphere

1/m^3

$C_{w,0}$

C_w0

Gas concentration in water

1/m^3

$k_w$

k_w

Gas transfer rate in water

m/s

$k_{ta}$

k_ta

Total transfer rate of gas in air

m/s

$k_{tw}$

k_tw

Total transfer rate of gas in water

m/s

$R_a$

R_a

Transfer resistance in air

s/m

$R_w$

R_w

Transfer resistance in water

s/m

$R_{tw}$

R_tw

Water to air transfer resistance of a gas

s/m

Calculations

• Alternative method
• Traditional method
• Strategy
• 2D
• 3D

Equation

Number

First, select the equation: to , then, select the variable: to

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Calculations

Symbol

Equation

Solved

Translated

Calculations

Symbol

Equation

Solved

Translated

Variable Given Calculate Target : Equation To be used

Equations

ID:(15645, 0)

Equation

>Top, >Model

The concentration gradient between the gas concentration in the atmosphere ($C_a$) and the gas concentration in water ($C_{w,0}$) depends on the gas solubility ($\alpha$). Therefore, the following relationship is established:

$C_w = \alpha C_a$

Conditions

Variables

$C_a$

Gas concentration in the atmosphere

$1/m^3$

9416

$C_w$

Gas concentration in water

$1/m^3$

9415

$\alpha$

Gas solubility

$-$

9406

Relation

ID:(12235, 0)

Equation

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The gas transfer rate in air ($k_a$) can be estimated from Fick's law by comparing the constante de difusión en masa acuosa ($D$) with the grosor de la capa superficial ($\delta_c$) as follows:

$k_a = \displaystyle\frac{ D }{ \delta_c }$

Conditions

Variables

$D$

Constante de difusión en masa acuosa

$m^2/s$

9414

$k_a$

Gas transfer rate in air

$m/s$

9407

$\delta_c$

Grosor de la capa superficial

$m$

9430

Relation

ID:(12227, 0)

Equation

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The gas parameter the gas transfer rate in water ($k_w$) is described in terms of the velocidad del agua ($u_w$), the velocidad del aire ($u_a$), the schmidt number ($Sc$), the factor beta del transporte aire a agua de CO2 ($\beta$), and exponente de Schmidt ($n$) as follows:

$k_w = ( u_a - u_w ) \beta Sc ^ n$

Conditions

Variables

$n$

Exponente de Schmidt

$-$

9926

$\beta$

Factor beta del transporte aire a agua de CO2

$-$

9409

$k_w$

Gas transfer rate in water

$m/s$

9405

$Sc$

Schmidt number

$-$

9410

$u_w$

Velocidad del agua

$m/s$

9437

$u_a$

Velocidad del aire

$m/s$

9408

Relation

ID:(12215, 0)

Equation

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The transfer resistance in air ($R_a$) is defined as the inverse of the gas transfer rate in air ($k_a$). This relationship can be expressed as follows:

$R_a = \displaystyle\frac{1}{ k_a }$

Conditions

Variables

$k_a$

Gas transfer rate in air

$m/s$

9407

$R_a$

Transfer resistance in air

$s/m$

9443

Relation

ID:(12236, 0)

Equation

>Top, >Model

The transfer resistance in water ($R_w$) is defined as the inverse of the gas transfer rate in water ($k_w$). This relationship can be expressed as follows:

$R_w = \displaystyle\frac{1}{ k_w }$

Conditions

Variables

$k_w$

Gas transfer rate in water

$m/s$

9405

$R_w$

Transfer resistance in water

$s/m$

9444

Relation

ID:(12237, 0)

Equation

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The water to air transfer resistance of a gas ($R_{tw}$) is defined as the inverse of the total transfer rate of gas in water ($k_{tw}$). This relationship can be expressed as follows:

$R_{tw} = \displaystyle\frac{1}{ k_{tw} }$

Conditions

Variables

$k_{tw}$

Total transfer rate of gas in water

$m/s$

9448

$R_{tw}$

Water to air transfer resistance of a gas

$s/m$

9446

Relation

ID:(12238, 0)

Equation

>Top, >Model

The air to water transfer resistance of a gas ($R_{ta}$) is defined as the inverse of the total transfer rate of gas in air ($k_{ta}$). This relationship can be expressed as follows:

$R_{ta} = \displaystyle\frac{1}{ k_{ta} }$

Conditions

Variables

$R_{ta}$

Air to water transfer resistance of a gas

$s/m$

9445

$k_{ta}$

Total transfer rate of gas in air

$m/s$

9447

Relation

ID:(12239, 0)

Equation

>Top, >Model

For the interaction between the atmosphere and the ocean, the air to water transfer resistance of a gas ($R_{ta}$) initially includes the transfer resistance in water ($R_w$), followed by the evaporation process $1/\alpha$ with the gas solubility ($\alpha$). Once the gas has transferred to the air, the transfer resistance in air ($R_a$) acts on it:

$R_{ta} = R_a + \displaystyle\frac{1}{ \alpha } R_w$

Conditions

Variables

$R_{ta}$

Air to water transfer resistance of a gas

$s/m$

9445

$\alpha$

Gas solubility

$-$

9406

$R_a$

Transfer resistance in air

$s/m$

9443

$R_w$

Transfer resistance in water

$s/m$

9444

Relation

ID:(12240, 0)

Equation

>Top, >Model

For the interaction between the atmosphere and the ocean, the water to air transfer resistance of a gas ($R_{tw}$) initially includes the transfer resistance in air ($R_a$), followed by the gas solubility ($\alpha$), and once the gas has penetrated the water, the transfer resistance in water ($R_w$) acts:

$R_{tw} = R_w + \alpha R_a$

Conditions

Variables

$\alpha$

Gas solubility

$-$

9406

$R_a$

Transfer resistance in air

$s/m$

9443

$R_w$

Transfer resistance in water

$s/m$

9444

$R_{tw}$

Water to air transfer resistance of a gas

$s/m$

9446

Relation

ID:(12241, 0)

Equation

>Top, >Model

The relationship between the transfer resistance between the atmosphere and the ocean can be expressed in terms of the transfer speeds in both mediums, equating to the inverse of the total transfer speed.

Therefore, with the total transfer rate of gas in water ($k_{tw}$), the gas transfer rate in water ($k_w$), the gas transfer rate in air ($k_a$), and the gas solubility ($\alpha$), it is established that:

$\displaystyle\frac{1}{ k_{tw} } = \displaystyle\frac{1}{ k_w } + \displaystyle\frac{ \alpha }{ k_a }$

Conditions

Variables

$\alpha$

Gas solubility

$-$

9406

$k_a$

Gas transfer rate in air

$m/s$

9407

$k_w$

Gas transfer rate in water

$m/s$

9405

$k_{tw}$

Total transfer rate of gas in water

$m/s$

9448

Relation

Development

The relationship between the water to air transfer resistance of a gas ($R_{tw}$), established through the sums of the transfer resistance in water ($R_w$), the transfer resistance in air ($R_a$), and the gas solubility ($\alpha$), is expressed in the equation:

$R_{tw} = R_w + \alpha R_a$

Including the relationship of the transfer resistance in air ($R_a$) with the gas transfer rate in air ($k_a$) in:

$R_a = \displaystyle\frac{1}{ k_a }$

The interaction of the transfer resistance in water ($R_w$) with the gas transfer rate in water ($k_w$) is described in:

$R_w = \displaystyle\frac{1}{ k_w }$

And the connection between the water to air transfer resistance of a gas ($R_{tw}$) and the total transfer rate of gas in water ($k_{tw}$) is detailed in:

$R_{tw} = \displaystyle\frac{1}{ k_{tw} }$

This provides the basis for establishing the relationship for the total transfer rate of gas in water ($k_{tw}$):

$\displaystyle\frac{1}{ k_{tw} } = \displaystyle\frac{1}{ k_w } + \displaystyle\frac{ \alpha }{ k_a }$

ID:(12243, 0)

Equation

>Top, >Model

The relationship of the transfer resistance between the ocean and the atmosphere can be expressed in terms of the transfer speeds in both mediums, corresponding to the inverse of the total transfer speed.

Thus, using the total transfer rate of gas in air ($k_{ta}$), the gas transfer rate in water ($k_w$), the gas transfer rate in air ($k_a$), and the gas solubility ($\alpha$), the following relationship is established:

$\displaystyle\frac{1}{ k_{ta} } = \displaystyle\frac{1}{ k_a } + \displaystyle\frac{1}{ \alpha k_w }$

Conditions

Variables

$\alpha$

Gas solubility

$-$

9406

$k_a$

Gas transfer rate in air

$m/s$

9407

$k_w$

Gas transfer rate in water

$m/s$

9405

$k_{ta}$

Total transfer rate of gas in air

$m/s$

9447

Relation

Development

The relationship involving the air to water transfer resistance of a gas ($R_{ta}$), determined by the combination of the transfer resistance in water ($R_w$), the transfer resistance in air ($R_a$), and the gas solubility ($\alpha$), is formulated in the equation:

$R_{ta} = R_a + \displaystyle\frac{1}{ \alpha } R_w$

This includes the relationship of the transfer resistance in air ($R_a$) with the gas transfer rate in air ($k_a$) expressed in:

$R_a = \displaystyle\frac{1}{ k_a }$

Additionally, the interaction of the transfer resistance in water ($R_w$) with the gas transfer rate in water ($k_w$) is explained in:

$R_w = \displaystyle\frac{1}{ k_w }$

And the connection between the air to water transfer resistance of a gas ($R_{ta}$) and the total transfer rate of gas in air ($k_{ta}$) is specified in:

$R_{ta} = \displaystyle\frac{1}{ k_{ta} }$

These elements together provide the basis for defining the relationship for the total transfer rate of gas in air ($k_{ta}$):

$\displaystyle\frac{1}{ k_{ta} } = \displaystyle\frac{1}{ k_a } + \displaystyle\frac{1}{ \alpha k_w }$

ID:(12242, 0)